Obviously there are similarities in focal length and aperture. Neither have image stabilization. I have heard the 70-200 is tack sharp between 70-135... which raises the question, is the additional range I will get worth the additional 400 dollars. I've already bought the 70-200, so I've answered my question, but I got it as such a good price, that I could sell it within a matter of days and then just get the 200 prime.
At the moment, I am shooting a ton of football games (pee-wee level). And I imagine I will be shooting indoor girls basketball games here in the next few weeks.
I already have a 24-105mm f/4L, 50mm f/1.4, and 100mm f/2.8L IS Macro.
Any advice is appreciated. If the 200mm prime is incredibly sharp wide open... or isn't head and shoulders better than the 70-200mm... I'll stick with the zoom. But I also don't want to use the 135-200mm range and be so disappointed that I never bother to use the lens.