I disagree after ALOT of experience with many film lenses on the A7r and A7, and now Kolari.
The A7 series do weird things with all sorts of legacy SLR lenses. For example I have the famous Canon nFD 24/2. It's terrible on un-modded A7. It's fantastic on the Kolari. The issues we have seen from the beginning with 50s like the Lux ASPH, which is awful on the stock Sony, and the long long struggle for high performance ultra-wide should be a strong hint the sensor cover glass has wide effects (though of course they vary.)
So, I say the SL is the best legacy platform for ANY film lens. Assuming you can find the adapters, which are dumb and should be no problem eventually.
Vivek, I started with A7r, sent it back and got A7 (this right at original release), then was so disappointed with A7 and film lenses, I bought an M9. Following year Kolari became option. I had one of the very first, which was good because as soon as it came back my M9 shutter went down :scry: For 6 weeks I only shot the A7.mod.
There is no comparison. The Kolari mod totally resurrected the A7 for me, and not just with M wides. You still have the lousy cooked Sony "Raw" files and various annoyances of the interface, plus the poor EVF, but it's fully usable and can make some great images.
Today I go everywhere with both bodies.
I've felt up to now that the A7 with native glass did offer some very good performance, though for various reasons I don't like the choices much (bad MF feel on some, size issues with others etc). But the Lensrental data is damning of the native path for landscape lovers like me:
"The FE 35mm f/1.4 ZA lenses are all over the place. It actually is a bit worse than the graphs look because a lot of the variance is WITHIN a copy, not just copy-to-copy. None of the 10 copies we tested had even corners. And I'll editorialize and say that none of the dozens we've tested on Imatest had even corners either. If you use this lens for centered objects, you'll be happy. If you want 4 sharp corners, it's not likely to happen unless your standards for equal sharpness are pretty low."
Later he talks about the 90/2.8 issues. Now, most of my regard for the native path has evaporated. However, my affection for my little Kolari A7 is higher than ever
Roger
LensRentals.com - Sony E Mount Lens Optical Bench Tests