Looking very nice overall. A few things:
1. Watch your hard edges, some are verrrry hard, esp the small levers and such. My rule of thumb is pretty much: if its aliasing badly in the viewport at normal viewing distance, your edges are too hard.
2. The knurling isn't quite the right shape, it shouild come to a definite point but instead flattens off into a diamond shape. This might help:
3. Your floaters are all hard-edge right now. You need a border edge around them to make them look seamless when added on top. Right now they look like entire separate pieces. The obvious ones here: "Leica" on the cap, the viewfinder windows, etc. If you need I can give you some images here that explain this.
4. Watch your intersections. Intersecting bits can be the thing that pushes a model from good to really great. As it is, the vulcanite(leather grip stuff) just intersects with the rest of the mesh(and the edges around the top part of the metal it intersects with are way super hard btw). You want the vulanite to border the metal, with geometry matching the shape, and nice little subtile soft edges there. It will give a very "solid" look, instead of the computery-random intersection look.
5. The rounded area on removable baseplate(bottom) that comes up to latch onto the body isn't quite right, the shape is a bit sloppy and could use some more geometry to represent it better, check your reference here a little better. Again the vulcanite should match up to this shape as well, so there isnt the hard intersection.
6. The black screws look to be sitting on top of the vulcanite, but really they're recessed into it. You can do this as a floating mesh, let me know if you're like an example image here.
This may seem pretty anal, but these little tweaks will help a lot!