Hi,
When I started _working_ as a photographer, I was using Koni Omega and Rollie cameras, but the 35mm of choice were either Leica or Nikon, and seeing what you were getting was pretty cool.
My first new Nikon was the 'F' and I still have and use lenses and accessories that are over 30 years old. There would be older accouterments, but I've had an active life and been robbed more than once, on the job, on vacation, and a theft at home
The simple reason is that I have too much invested to switch to another brand, but everything works pretty well or I wouldn't have stayed with it for so long.
My best,
Mike