I am about to purchase a 50 f1.4 lens for tight shots under the basket in tournament basketball. I had thought about an 85 f1.4, but now find that from my usual vantage point, it's simply too tight a focal length....even 70mm is pretty tight. So luckily I get to save a few bucks and buy a 50. I do own a 28-70 f2.8, (as well as my workhorse 70-200 f2.8) but I want this lens for extreme low light gyms as well. I will be shooting it on a D3 now....and in spring I'll add a D4.
My question is which would the sports shooters out there advise I buy ...The newer G or the old D ?? Of primary importance is relatively decent autofocus speed, and optics (of course).