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Can't say the MTF charts on the primes are overly inspiring. But the zoom does look impressive, certainly a huge improvement if it lives up to what the charts suggest.
Yeah hard to say. I do wonder why for $850 the 24 2.8 IS has no UD elements. You'd think it should show a better MTF curve than for the new 24-70 zoom and it does not (to be fair it looks similar to the 24 1.4 II chart, but all the same, for $850 and a slow prime, why should it not beat the zoom and fast prime, which are tricky to build?)
I guess it looks like it will do pretty well, and nothing to really complain about and yet for $850 it seems for a couple bucks more spent on elements it might have been blowing zeiss and all out of the water and for that price maybe it should.