Full info on this lens can be found at zyoptics.net/product/mitakon-creator-135mm-f-2-5-lens/.

Here is a short lens review:

CameraLabs tested this rather unique lens and concludes:

Laowa’s 25mm f2.8 2.5-5x Ultra Macro is a very special macro lens: Its major attraction is being able to achieve up to 5x magnification (at working distances around 4cm/1.6in) without any additional gear. But – like other lenses achieving 5x magnification – it has only manual focus and cannot focus to infinity. The lens produces sharp images with very little field-curvature across the full frame, copes well in contra-light situations, has pretty nice Bokeh, and comes at an affordable price. This all clearly earns the 25mm f2.8 2.5-5x Ultra Macro a recommendation. Just make sure to use a good focus rail and focus stacking software.

Someone on Weibo modified the NEX-5 mount to fit the Rayqual 50mm f/0.75 lens (you can find it here on eBay). The results can be seen here:

SonyAlphaBlog reviewed the 7Artisans 10mm f/2.8 Fisheye lens and concluded:

The 7 Artisans 10mm F2.8 Fisheye (300 euros) is a Compact stereographic fisheye with good sharpness in the center as of F4 and good on the entire field as of F8. Color rendering is good and background blur is soft.
The closest competitor is the TTArtisan 11mm F2.8 Fisheye (300 euros) that offer a similar rendering with a better sharpness but a less good resistance to flare. On 24Mpix the 7Artisans will be recommended, on 42/50, 61Mpix the TTartisan will be more suited

If you want to be as compact as it gets your best option is to travel with the Sony A7c and the new small Sony compact primes. 42West published an article (Click here) where they share their experience in Lissabon.

And this is their video:

Christopher Frost compared the three manual APS-C E-mount lenses:

7Artisan 35mm f/0,95 (here on Amazon US, Amazon DE, Amazon UK).
Mitakon 35mm f/0,95 (here on Amazon US, Amazon DE, Amazon UK).
Venus 33mm f/0,95 (here on Amazon US, Amazon DE, Amazon UK).