DxOmark tested the 24-70mm Sigma lens for Sony and writes:

Over image quality is good and both sharpness and uniformity are good when stopped down a little but the Sigma has high levels of chromatic aberration, particularly at the shorter focal lengths. Given the performance and the inclusion of an ultrasonic type AF motor, it’s fairly priced at $899, but still somewhat overshadowed by the better corrected and more accessibly priced Tamron.

The new Sony 50 Megapixel CMOS sensor is not going to be used by Hasselblad only. Also Phase One launched the new IQ250 Digital Back featuring exactly the same sensor. And Luminous Landscape (Click here) is the first website showing first image samples taken with the new Sony medium format sensor! They had no time to make a full Image Quality test but so far they say:

While this is in no way conclusive at this point, we must say that for ISO 6400 we are seeing some very impressive results compared to what is seen with older backs.

UPDATE: Some more image smaples at Pdnonline.

This is the interview with Phase One that talks about the sensor:

PhaseOne-IQ250-SkypeInterview from The Luminous Landscape on Vimeo.

This is juts me dreaming, but I want a $6,000 mirrorless camera with that sensor! A sort of digital [shoplink 24155 ebay]Mamiya 7[/shoplink]!

Dpreview is certainly (still) the most famous camera review site. But some of their Sony A7 conclusions lead to a big discussion among SAR readers. And today DPreview (Click here) also explained in a new article some of the problems they had with thrid part lenses.

Well, not everyone agrees with Dpreview conclusions. A detailed critic of the Dpreview test has been posted by SoundImagesPlus (Click here). He writes that at least two “cons” listed by Dpreview are not correct:

1) Dpreview says: “Tools for shooting with third party lenses need improvement” SoundImagesPlus writes:

I really don’t understand the third party lenses quibble. One button press to bring up a magnified view and focus peaking. Both work really well and I haven’t used anything that’s any better than this. Their comments – ‘With so many adapters available, the a7 is a very attractive option for owners of third-party lenses (which is discussed in more depth in this article). While Sony has provided tools for focusing these old lenses – such as magnified view and focus peaking – they don’t work as well as we’d hoped.’ really don’t make any sense to me. The whole method works fine for me, it’s quick, accurate and reliable. What’s their problem?

SAR note: I own the [shoplink 22851 ebay]Canon 55mm f/1.2 FD[/shoplink] and am absolutely satisfied with how it works on the Sony A7r. Completely agree with SoundImagesPlus on that point!

2) Dpreview says: “JPEG quality disappointing compared to peers – crude sharpening, over-aggressive processing and occasional posterization.” and “The areas that need the most improvement are related to JPEG image quality. While we recognize that some a7 shooters will be using Raw exclusively, those who are shooting JPEGs will see smudged details and strange artifacts, which are amplified if you edit and re-save them.”

SoundimagesPlus answer: “Quite simply having minutely examined the jpgs. from my A7 and A7r, I have no idea what they are writing about. Plus they give an example from one of their test shots, which try as I might I just cannot see. In fact I take the complete opposite position to them. I think the jpgs. from these two cameras are the best I’ve ever seen“

SAR note: I am not a professional reviewer. But from my short experience with the Sony A7-A7r JPEG engine is quite a lot better than the NEX-7 engine (I owned the camera before). And I see no major difference with the Nikon D800 shots (my company owns the camera and I did some basic testings with it). That said other reviewers wrote exactly the opposite of Dpreview claiming the Sony JPEG look quite goo. Example: DSLRmagazine (google translated article), Focus Numerique (google translation here) or Cameralabs: “the out-of-camera JPEGs from the A7 looked comfortably superior to the 5D3. In the 20-24 Megapixel class, I’d say the A7 is an excellent performer.“.

Overall I found many of the Dpreview critics correct although most of them are very insignificant for the kind of shooting I do (Example: missing built-in Flash is not a problem for me!). But the two points mentioned here in these post really go against the personal experience I had with the A7-A7r.

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Specs and Store Links in US and Canada:
Dedicated Sony announcement page at Amazon US (Click here).
Sony A7r body at Amazon, Adorama, BHphoto, SonystoreUS. TheCameraStore Canada.
Sony A7 body at Amazon, Adorama, BHphoto, SonystoreUS. TheCameraStore Canada.
Sony A7 with 28-70mm kit lens at Amazon, Adorama, BHphoto, SonystoreUS. TheCameraStore Canada.
Sony RX10 at Amazon, Adorama, BHphoto, SonystoreUS.
Zeiss 24-70mm at Amazon, Adorama, BHphoto, SonystoreUS.
Zeiss 35mm at Amazon, Adorama, BHphoto, SonystoreUS.
Zeiss 55mm at Amazon, Adorama, BHphoto, SonystoreUS.
70-200mm A-mount at Amazon, Adorama, BHphoto, SonystoreUS.
Sony A-Mount to E-Mount Lens Adapter at Amazon, Adorama, BHphoto.
Sony A to E adapter with mirror at Amazon, Adorama, BHphoto.
A7/A7r leather case at Amazon, Adorama, BHphoto, SonystoreUS.
A7/A7r vertical grip at Amazon, BHphoto, SonystoreUS.
Sony W Series Battery Charger at Amazon, BHphoto.
Sony FA-CS1M Off-Camera Shoe at BHphoto.
Semi-Hard LCD Screen Protector for A7-A7r at Amazon, BHphoto.

Specs and Store Links in Europe:
Sony A7r body at Sony DE, UK, FR, IT, ES, NL, BE, CH, AT, SE, FI, NO, PT,  WexUK, WexDE.
Sony A7 body at Sony DE, UK, FR, IT, ES, NL, BE, CH, AT, SE, FI, NO, PT, WexUK, WexDE, Amazon UK, Amazon DE, Amazon FR.
Sony A7 with 28-70mm kit Sony  DE, UK, FR, IT, ES, NL, BE, CH, AT, SE, FI, NO, PT, WexUK, WexDE, Amazon UK, Amazon DE, Amazon FR.
Sony RX10 at Sony DE, UK, FR, IT, ES, NL, BE, CH, AT, SE, FI, NO, PT, WexUK, WexDE.
Zeiss 35mm at Sony DE, UK, FR, IT, ES, NL, BE, CH, AT, SE, FI, NO, PT,
Zeiss 55mm at Sony DE, UK, FR, IT, ES, NL, BE, CH, AT, SE, FI, NO, PT
Zeiss 24-70mm at Sony DE, UK, FR, IT, ES, NL, BE, SE, PT
Sony G 28-70mm lens at Sony DE, FR, IT, ES, NL, BE, CH, AT, SE, FI, NO.

Asia:
A7r at Digitalrev.
A7 at Digitalrev, Amazon Cina.
A7 with 28-70mm lens at Digitalrev.