I'll start with one I took today with the a6400. I'm a little surprised that besides maintaining excellent contrast and sharpness, this lens seems to deliver neutral colours, and I'm skeptical about Sony colours.
From some reviews I've read, people seem to have better impressions with this lens paired with APS-C cameras than FF with reasons like longer FL, sharper centre crop and overall a more reasonable upgrade from the kit telephoto zoom than the 70-300 5.6 and 70-200 2.8GM. I'd of course, love to have FF to use this lens with but so far have been really impressed with the performance on APS-C, I've seen sharper, creamier results from prime lenses like the Fuji XF90 F2, not any zoom lenses, the event shooting last week with my friend's Canon 70-200 2.8 Mark II on the APS-C M50 didn't impress at all.
Here's the last photo I'll probably ever post taken with this lens, I've sold it and I'll probably get a longer telephoto in the future. It doesn't reach long enough and the transmission (T-Stop) isn't the best but those are the only bad things I can say about it. Hopefully someone finds this thread useful and post more with their copies. This one is a heavy crop and I've noticed it isn't quite easy to focus on the right place when the lens isn't long enough in the first place.