I really hope 85LII can be upgraded.
Not for the reason of its IQ, but its build quality regarding dust-proof, drip-proof, mechanical loose and front extension.....
If mk3 can solve some of these especially dust proof and loose...I shall buy it.
I don't expect to buy a L toy but has to worry about its build quality.
I don't mean to sound obtuse, but from your comment, I get the impression that you do not own the 85mm f/1.2L II....I do and use the lens alot. I'd like to address your complaints about this lens:
>build quality - IMHO, the build quality of this lens is outstanding. It is solid and feels the same. I'm not sure what your complaint here is, but my experience with this lens is completely opposite. Photozone and other test sites agree with my assessment.
>dust and drip proof - my lens has no dust at all and I have no reason to bring it out into the rain and this would not be a reason for me to u/g to a ver III.
>loose front extension - I'm at a loss as to what you are referring to with this comment. The lens is focus-by-wire. As a result, the focus ring moves freely as the lens is designed. Again, my copy has no loose moving front extension at all.
Please help others reading your comments with some specifics so that potential buyers of this outstanding piece of glass can take your comments and make an informed buying decision. Given the latest Canon price increases for new equipment, expect the 85 III to be $3000+.
I think Canon should concentrate their manufacturing efforts satisfying promised deleivery dates for the 1D X, 5D III, 400 II, 300 II, 500 II and 600 II, 200-400, the previously announced WA primes, 24-70 II and the list goes on rather than upgrading a lens such as the 85 II that needs no u/g until the end of it's ten year cycle in 2016/2017.