Just got a D500 specifically wanting a crop body for telephoto. The marketing hype stressed the high ISO performance of the D500, but I thought it was only that--hype. Wasn't expecting the crop body to compare to the low light performance of a full frame sensor. I was wrong. Two shots taken on a tripod. D810 vs D500. Both 1/10 sec @ f/4 and ISO 12,800. The D810 with a 24-70 at 45mm. The D500 with a 17-55 at 30mm. D810 D500 I'm not sure these small files really highlight the difference adequately. It's pretty dramatic looking at the full size files (not pixel peeping, just looking at the full size images). The D500 is better than the D810 at high ISOs despite it being a crop sensor. The two are different tools and they each have their own place, but this result surprised me somewhat.