my vote goes to the S2 Pro. specs wise, they aren't very different. but the S2 Pro churns out awesome brilliant colours. some will even tell you the S2 Pro provides even more vibrant colours compared to the S3 Pro and S5 Pro. i've never compared the pics from S2 Pro, S3 Pro and S5 Pro side by side so i dun have any stand on that statement.
I have used all the Fuji DSLRs available to-date. I must agree that among all the Fuji DSLRs, the S2 Pro has the best color and best white-balance. The color is ever so vibrant and natural. The D70s cannot fight lah!
I would normally choose the S2, though the D70s would be a little fster in operation. The S2 color just seem smoother and brilliant. But then you need to accept slow everything when using the S2. It also works very well with my SB25 :thumbsup: