Lenstip tested the new Sony 28-70mm f/2.0 GM and concluded:
In a nutshell the Sony FE 28-70 mm f/2 GM test showed that you get here an outstanding 2/50 standard lens along with three very good, momentarily even excellent 2/28, 2/35, and 2/70 primes in just one instrument. Of course you have to remember that you deal here with a big and heavy zoom lens, although Sony tried their best to make it easier to handle and to use than the rival Canon device.
Still, if you wanted to get almost exactly the performance offered by the Sony you would have to buy as many as four primes. There is also another problem – no producer has 2/28, 2/35, 2/50, and 2/70 models in their line-up although it seems Sigma is the closest to that goal, offering you in their C line the following lenses. It’s easy to add up their weight – it would amount to 1440 grams so over half a kilo more than the weight of the tested Sony model.
Becca Farsace explains why Sony needs to launch a new 1-inch R100 camera model. Personally I don’t know if Sony will ever do this. First of all they have the ZV-1 lineup that is probably the true replacement for this series.If anything, I think a new model in the Sony RX1 full-frame series is needed more. Do you agree with my opinion or do you lean more towards Becca?