I think I have owned all available prime focal lengths from 14mm to 600mm over the years, and I still have quite a few. I also have zooms covering 8mm to 400mm, but many of them collect dust on the shelf.
My most used primes are the 35mm f1.4 and the 85mm f1.2. I do not use the 135 f2 very much. It is a great lens, but I often end up using the 70-200 f2.8 instead. I know a lot of you like it for outdoor portraits, but I prefer the 85 for that. I have also used the 50mm f1.2 a lot in the past, but have now sold it, because I find the 35/85 combo so much more usable and their IQ is outstanding.
As I said in another thread, summing up my production over a year, probably 80% of my images are shot with the zooms, but probably 80% of my best keepers are shot with the 35mm and 85mm (not counting sports, wildlife and birds shot with the great whites).