Budget is $2000 and under. I have rented some fast zooms (Canon 70-200 II and Canon EFS - 17-55 f2.8) when doing some indoor shooting. I have read that the 7D MkII has improved AF and handles higher ISO better than the 7D. I rented a Canon 70-200 f4 IS for a outdoor XC meet and I am not sure that I could tell any difference in IQ from my 70-300 NanoUSM in that setting