sharpness is just a contrast trick, you can add it in post. If you are talking about detail, that camera is awesome as you can see in lab tests. Some people think that the images lack detail because of the deep DOF that is really distracting. Some people actually think that DSLR videos are sharper, just because of the shallow DOF that calls attention to the subject.
So well, what you think its a problem is actually some of the strong points of this camera. and its small and waterproof! I have camcorders, full frame DSLR's, and APS-C mirrorless. If I had to choose only one camera for videos, the GW77 would be the one!!