Should think It would have more affect on the need for fast wide angle primes! Really any need for a 24mm 1.4 anymore?
Have you ever used a 24 f1,4 L II on a fullframe body?? The look of the picture you get at that wide angle and that shallow depth can't be done by anything else.
Nope, never have, but I would certainly love to see an example of a real world shot using the 24 1.4 wide open [out of 100 shots - how many @ 1.4?] compared to ones shot at f2 or even 2.8 - real difference? care to share? Anyway, I didn't really mean to suggest that nobody would want the faster wide angle lens, but they are pricey, big and the DOF advantages aren't as obvious [compared to telephotos]. I'm simply surmising that many [most?] folks will find less need for them as high ISO performance improves. If Canon made a nice 24mm f2 L - I'd be all over it!
I'll go out on a limb and predict that across the board - high ISO cameras will increasingly cannabalize [not eliminate] the sales of fast [zoom and prime] lenses for ALOT of shooters - how could it not? Size and price
really do matter!