APS-C, because it'll accept EF-S lenses like 17-55/2.8
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If you had carte blanche to upgrade this lens, what would you do? What specs would it have after your upgrades?
After painfully wading thru this, I think I can sum it up for those of you who start at the end:
Anyone who wants more megapixels than "me" is an idiot and doesn't understand picture quality.
Anyone who wants fewer MP than "me" doesn't do real photography.
Ansel Adams still rocks.