Since you take product shots, you should ask yourself if your current lighting setup is sufficient.
If not, then a 5DII won't really improve much for you. You better spend your money on a better lighting setup.
If you already get good results with your current setup, 5DII would offer even better IQ. Not to mention that all your lenses will be wider on FF (no more multiplied by 1.6x), which might help framing industrial shots. You will also love the shallow DOF of FF for portraits.
Btw, I'm not sure but it seems to me that the Tokina 11-16 is an APS-C only lens. You should check that out once.