Finally got into the underlit gym with my 7D and 135L. Girls basketball (not my usual subjects), but I must say the 135 outperformed my 70-200 2.8 II. Mostly shot wide open and got the ISO down to 800/1600 and sometimes 3200 with shutter speeds 1/750 or 1/1000. I'm happy looking at my screen, though these compressed images don't do it justice.
These were all handheld, no monopod, M, AI servo, zone select, f2, autoISO, and shutter speed adjusted via viewfinder exposure meter.
Thanks for sharing. I can now see how this lens works with indoor sports.
This helps in my purchase decision of this lens. Thanks again!