There seems to be a commercial grade and a consumer grade of almost anything. Or, if you prefer, an industrial grade and consumer grade. I admit that successful professional photographers tend to use the heavy duty, more reliable equipment, and they tend to choose the stuff that will be able to stand up to very hard use. Feature sets usually take second priority, with some notable exceptions. Image stabilization seems to be a feature preferred by PJ's and nature photographers so they tend to shoot with the cameras that allow them to use lenses that provide that feature. As it happens, those are features of the commercial grade (or industrial grade) camera makers. Though you can use those lenses on their consumer grade bodies, as well.
The working pros that I know use their gear pretty hard but they have it serviced on a regular schedule even when it is still working properly. Of course they have plenty of backup gear, so they don't have to postpone work while things are being serviced. Len ---
