Long time reader, first time poster. I'm a long time EF lens owner, 400 2.8, 300 2.8, 200-400 (560 with built in), 500 f4, etc... I own 2 x 1dx mark iii's as well and that has been my go to body for the past 3-5 years. I've spent many years shoo...
Thanks everyone for all the thoughtful replies. I'll share a bit more. The 1DX Mark iii is prefect for sports and 90% perfect for concerts, the noise level is an issue for me and has been for a while. I shoot everything from hard rock concert...