I've posted this elsewhere, but looking at the MTF charts, and knowing a ton of people will now be seeking used Mark I's out there, I may very well trade up for the Mark II. I especially think that if this is your bread-and-butter lens, it's definitely worth having the newer version. the old one is great but I wouldn't say prime-rivaling, but the new certainly looks like it could really negate the need for f/2.8 primes in that focal range, like ... ever.
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