I think I'll stick with multi-coated.
I bought a set of non-HMC Hoya filters to see if I liked the change in tonal relationship for skin tones. I like what they do--I definitely do. I did a quick test by varying the apertures and keeping the shutter speed constant and I notice a lack of sharpness but since my aperture was opening up less detail is expected. I guess I can perform another test by varying the shutter speed but I thought I'd get some input first.
I'm leaning towards multi-coated because if/when I run into a situation where a bright object is in the frame, I'd probably regret having a non-multi-coated filter.