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My D3s cameras outperform the D4 in focus and color balance in low light. Somehow, the low light images just plain look better on a D3S rather than the D4 although the file size of a D4 would sometimes be nice to have.
For sports, the D4 is much quicker but the focus is also much more erratic, so it's a wash.
I agree that the CF card situation will probably change sometime soon but for now it is still the industry standard for pro cameras, and the D3S allows 2 slots.
One of the two funny rubber thumb joy sticks...Show more →
My experience was somewhat different than yours. The ISO advantage over the D3s was not that big, but the D4 focused much better in any light and I didn't find it erratic. The sub-selector is something that I don't use that often, but, I have read reports of it popping off. As to the memory cards, I happen to like the XQD cards, though they are expensive. I was disappointed that Lexar back out of this market. The XQD is smaller, doesn't bend camera pins, doesn't slow down like CF cards under continuous use, and less likely to malfunction. I think the price will drop in time.
But, all that said, the D4S is by far the better camera.