I don't understand why people start a debate about software's and tools..
Which Software is better?
______ vs _______Software?
You will never find a solution out of that.Fans will be fans but we are professionals or Professionals to be..
Now as per your question...Cinema 4D is just a tool like Maya and it is your own choice to choose the best one that will work for you.I personally haven't used Cinema 4D and don't know much about built-in Camera projection tools(what kind of tool) but I have done some camera projection stuff on Maya few years ago.And I only remember some fractions of it that required some camera setup data,some modeling for projecting with camera Animation and tweaking stuff in Photoshop/AE or any Compositing package.
Camera projection can be done in any 3D package even in compositing packages like AE,Nuke,Fusion etc..
It's a method of mapping 3D points to a 2D plane..That's it!
People can use Cinema 4d or Maya or Any other package.
In Movies more people use Maya than C4D but C4D is more famous in Motion graphics.
And more than software or tools you require the skills..
Perspective and Free hand drawing is the most important aspect for a Matte Painter
So Please fix it if you want to sustain in the Industry!
You never know which new software will be there when you finish up with Mari or any other package..Be Proactive