Not perceived, but a reality for us. An OVF at this time is essential. It's our preference for quality and allows for hand-holding of our f/2.8 300's and 400 primes at games where we are following very fast-moving athletes and switching from athlete to athlete. Not possible with an LCD or EVF. The 600's 800's and 200-400's Can't do it as stuck to a gimbal or mon/tri-pod the ability to follow the action is hampered. The EVF does not at "this time" offer the same response at the OVF. Perhaps in the future technology will make it so. I do like that the EVF is more reflective of exposure for those who are not as skilled as our senior people but anyone who can't function on manual would not be a "primary" photographer for our firm. Right now in skilled hands the OVF is still the most effective modality for high-speed professional sports with NFL, NBA, NHL and Extreme sports offering particular challenges. Some extreme sports are more difficult than perceived based on outdoor venues, bright sun and sea/ocean venues. Not seen a EVF up to it yet and I'm open minded. I think this will be a good 2 years away well after the Tokyo Games. It would be nice if by 2024 EVF's are perfected so the Olympic Games set a standard after 8K monitors make it into more homes and consumers can enjoy the types of resolutions we'll be shooting at. Perhaps people in their homes will finally see what we see when we shoot and edit! Best to you.