I work with a Canon 20D. The camera is good but it's the lens I used for these shots that makes the difference. In my little humble opinion it's the best lens Canon makes - a 135mm 1.2. I bought it for my husband for a christmas gift
(so that I could take some shots of 2 of our sons wrestling last year indoors without using a flash). Best gift I ever gave anyone
Only short coming is that it is a fixed focal point (rather than a zoom) so I need to physically back up at times. BUT this is working out great with the girls because it allows me to keep working that STAY command. True confession: I had flakes of freeze dried ice cream on my head to get them to stay while I backed up to take the shot of them together!
Juli