Canon 100-400 II compared to Nikon 200-500 - FM Forums
Nikon AF-S 200-500 VR review – Ari Hazeghi Photography
Canon RF 100-500mm f/4.5-7.1 USM L IS - Review / Test Report
Tony Northrup on Twitter: "Canon 7D II & 100-400 II vs Nikon D500 & 200-500. #Nikon combo is cheaper, sharper, cleaner. More tests coming. https://t.co/lKruOdkV4n" / Twitter
Re: Canon 100-400f/4.5-5.6L IS II vs Nikkor 200-500mm f/5.6e ed: Canon SLR Lens Talk Forum: Digital Photography Review