Where the thumb rests on the grip, the gradient down isn't sudden, it's a gradual transition. Also, be careful near the back: there's a bit of pinching. In reality, it should be 'hard' until it reaches the end of the backplate.
Only just saw this now. Have a look at Farfarer's Vertex Normal Toolkit. You can find some other useful scripts for modo linked in the google doc in my signature. Generally I use PipelineIO though to set hard edges by UV seam on export, so I don't really worry about the shading in modo.
This: You don't want realisticly hard edges, because they will not bake properly. always think with exaggeration. right now your edges are pretty realistic yes, meaning they are too tight for a bake. you want to pull your supporting edges more away from the edge you want to crispen in order to smooth it slightly and have…