I haven't seen someone else releasing this in 1080p even when the show is clearly above 720p. It has probably multiple resolution in it. But it seems that most of the stuff is between 900p-1080p (that's normal for J.C. Staff).
Here's another comparison (less white is better): 810p vs 900p vs 1080p
I recommend you to put GJM's subs above it with something like sushi. I won't release it subbed. Enjoy your lesbian anime animal girls!