The A7r2 has a very special sensor, great DR, excellent high ISO, and now even great files. I've been waiting to see a thin filter mod for use with RF glass. (Stock the camera is no better than A7 stocks when it comes to RF wides--despite claims to contrary)
Well I found one. And I found a lot more than that. The mods, which until now have only equalled M240 with certain lenses like SEM18 and 28 Lux, are evolving.
Read all about it: