Tokina vs Zeiss?
I just got a Tokina 100/2.8 ATX-Pro macro lens, and I took a few test shots from my window: camera resting against sofa, shutter speed high enough not to induce any motion blur, manually focused using Live View.
Below is a comparison vs. a similar pic which I took soon after acquiring the Zeiss ZF.2 85/1.4.
What do you all think?
Well, of course neither of those images show good IQ...shooting through glass and/or hazy atmospheric conditions are usually not helpers when evaluating lenses!
Almost all modern macro lenses from the top manufacturers are optically solid.
You might try comparing to a Zeiss that is more comparable (but not in price!) to your Tokina macro (e.g. the Zeiss 100/2 Makro).
Then shoot a sharp target with no glass and minimal atmospheric interference.
Use a fast shutter speed and/or mount on tripod with live view, etc.
Alternatively, try shooting some portraits with the Zeiss 85 1.4 (not the best in the Zeiss stable BTW) and then get some portraits with the Tokina.
The Tokina is a fine macro lens. I'm sure that you'll enjoy it!