If you get good quality, multi-coated filters (e.g. B+W MRC or the high-end Hoya filters) then you can stack them without loss of image quality, as long as you're not vignetting. Stacking even slim filters on a UWA lens like a 16-35mm on FF or a 10-22mm on a crop body is likely to vignette at the wide end. Keep in mind that a slim CPL is the same height as a standard filter.


Personally, I keep B+W MRC UV filters on my lenses at all times. The F-PRO mount is pretty thin, and on my 10-22mm I use the XS-PRO mount, a slim filter that retains front threads. If I need a CPL or ND filter, have time to set up, and I'm in a dry, non-dusty environment, I remove the UV and put on the other filter. If I'm short on time, or at the beach, etc., I stack other filter onto the UV.