It's all about sample size. My experience, with a lens that I use maybe 4 times times a year, even 20 busy pros experience with that lens using it every day, are statistically meaningless compared to a huge rental organization's repair data on that lens.
The viewfinder is an old-school optical one, which I have used before. If you compensate for the parallax it is fine. The only issue I had was mounting a filter to the lens, which is about a 49.5mm thread. Small sensor, but enough image-enhancing technology that the output is great. It also has a silent mode, with no shutter noise or lights at all.