Today, Which Professional Still Camera I Can buy?

I'm a Professional photographer, i won nikon d40. D90 and 300s
i'm interested in nikon d750 and nikon df can anybody tell me the difference between them (i expect answers from who truly used these cameras, experienced photographer answer)
no chance of buying canon brand coz i have nikon lenses 1.18~55, 2.18~200, 3. 50 mm normal

D750 is more newest one.
you can more high performance with that.
df is also good but that item focus on classic style.
more auto focus, more less noise, more night shot the d750 has.
df has the expeed 3 camera cpu. But that thing is also old one.
d750 uses expeed4 camera cpu which one is same with d4s which one is flagship model in nikon.
if you wnat to real shot performance, you have to choose d750, but if you want to fancy old classic feeling camera, you can choose df.

Really?
buy better lenses first, maybe something really good and that fits FX bodies… Then start to think about a new camera

The D750 is the superior camera.

Here's a side-by-side comparison of the two: http://www.dpreview.com/...s=nikon_df

Incase you don't know, you should be aware that you'll need to replace your 18-55 lens since it won't work on a full-frame camera. Also, the 18-200 is an amateur, entry-level lens that isn't designed for professional work. Your 50mm is the only one that is usable even it's only the f/1.8 and not the f/1.4. However, you should consider upgrading the 50mm too.

You are a professional but need advice in comparing two camera models?!

I'm a dentist. I think I will go to the Health forum and ask if someone can tell me how to fill a cavity.

Makes as much sense as a "professional photographer" having to come here and ask such questions as yours.