The Sopra might have a touch more air or it could just be a hair more tipped up too. The Revel counters with being able to play stupid loud if your into loud. Sometimes loud is fun. But both these brands are much better than the B&W 805d3 (probably d4 too). Both to my ear and objectively based on the measurements.
After demoing the Kef reference 3,Wilson Audio Sabrina, Sonus Faber Olympica nova III, Klipsch Cornwall IV, 803d3,804d3, revel 328be among others I bought the Revel 228be.
Anyway listen for yourself in this comparison video linked below. I think you will find they have very similar house sounds. Back to back sound demo, same room, same song, same system of the Sopra 1 and 226be. If I listen to this demo with my eyes closed I have a hard time telling the speakers changed.
https://youtu.be/Y7xJjesFGKk
Review with kippel measurements here. https://youtu.be/r1JjCVVgIdc
Detailed measurement breakdown here. https://www.audiosciencereview.com/forum/index.php?threads/revel-performabe-f226be-floorstanding-spe...

