No sports games have come out yet on UE 4. Action Arcade Wrestling 3 is using it, but that game's still in development.
UE 3 was used in several sports games:
Tony Hawk's Pro Skater HD (terrible)
WWE All Stars (pretty good)
Black College Football: The Xperience (subpar)
Kinect Big League Sports (never played it)
Real Boxing (never played it)
Lucha Libre: Heroes del Ring (never played it)
Supersonic Acrobatic Rocket-Powered Battle-Cars (never played it)