Evan Peters

Both come from a 4K scan of a 35mm film out which was made from the original 2K DI but the Lionsgate release has visible dust and damage marks while the Universal release is cleaned up more thoroughly. Both releases suffer from DNR which seems to have been baked into the DI. The colour grade is basically the same for both releases but the Lionsgate has Dolby Vision whereas the Universal is HDR10 only. The compression on the Lionsgate UHD base layer is apparently fine so the FEL doesn't make much of a difference.

The Lionsgate UHD has Dolby Atmos whereas the Universal UHD has DTS:X. Kick-ass was originally released with a 5.1 track which may be on the Universal Blu-ray.

The Lionsgate UHD is on a BD-100, the Universal UHD is on a BD-66.

The Universal UHD has no extras.