How did things look/compare in the corners?Well I got the 105mm Z Nikon and I have to say I'm a little letdown for overall sharpness. It's barely better than my TT Artisan 100mm 2.8 (the recent one). Maybe 5% sharper.
Better color and contrast by default on the Nikon but if it's a pure sharpness comparison it's not really much better at all. There does't seem to be anything wrong with the Nikon. The TT Artisan is a lot of lens for the price, but it's full manual. Chinese lenses are not playing around these days. Nikon on the left, TTartisan on the right at 1:1. Once corrected the TT artisan is extremely close. I'll be keeping both, the TT for the 2:1 and the Nikon for autofocus/weather sealing and focus stacking. It leaves me seriously wondering about the Tamron 90mm though.
I guess it makes sense as Nikon and the TT Artisan are made in China. The TT artisan just doesn't have the bells and whistles but optically it's excellent. $300 vs $850.
When corrected:
--Ken