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.
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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.