Alan and others that are interested, I'm playing around in DPP trying to see what gives the best results, so here is a shot from an hour ago with the details. It is almost uncropped with 1DX II 400 DO II X2 III. AF servo, spot focus (exposure linked) with 8 pt expansion was on his head, ISO 3200 F8 1/1000 Standard style, hand held
DPP - Exp + 1/3, pulled back 1/3, Lighting opt std., shadow +1, Unsharp mask str. 3, F 8, Thr 3 (lower and noise rises). No noise reduction, Lens optimizer - 65. That's about it.
I'm surprised at how good my 6D has been for IQ with 300 X2 and presently don't know if I'm at that level with 400 X2 but it's pretty close. AF is really fast and I love the illuminated focus points.
Jack