I also mostly use PL lenses with my FS7 and F55. The mechanical and ergonomic performance of a PL lens is almost always better than an equivalent SLR lens even if the optical qualities are similar.I have all PL mount lenses, since I didn't have any still glass to begin with. .
I have a couple of SLR macro lenses I use with the FS7 for closeup shooting; and a Canon 200-400 f/4 w/1.4 tele-converter that I use with the F55 for wildlife; but everything else is PL. I only use those couple of SLR lenses because those specialty lenses aren't really available in PL mounts.
These three lenses are my workhorse lenses and account for 99% of my shooting:
15.5-45mm Zeiss LWZ f/2.6 PL
50-150mm RED f/2.8 PL
200-400mm Canon f/4 with built-in 1.4x extender
But I also own:
35mm Sony f/2.0 PL
50mm Sony f/2.0 PL
85mm Sony f/2.0 PL
25mm Schneider Cine-Xenar f/2.0 PL
35mm Schneider Cine-Xenar f/2.0 PL
50mm Schneider Cine-Xenar f/2.0 PL
75mm Schneider Cine-Xenar f/2.0 PL
95mm Schneider Cine-Xenar f/2.0 PL
11-16mm Duclos f/2.8 PL
300mm RED f/2.9 PL
17-35mm Nikon f/2.8
35-70mm Nikon f/2.8
80-200mm Nikon f/2.8
300mm Nikon f/4
55mm Konica macro f/1.8
28mm Konica f/1.8
18-105mm Sony f/4 e-mount
20mm Sony f/4 e-mount
I have more lenses than I need, but why sell them? They will hold their value and I can sell them anytime I want down the line for about the same as what I could get for them today. It is like an investment that can be liquidated anytime. That's my way of looking at it.