PAL discs play 4% faster in American players, making voices higher-pitched and physical motion slightly unnatural, or very unnatural, depending on the mastering. It has to do with SECAM > NTSC conversion and 25 as opposed to 24 frames per second. Nevertheless I've bought many PAL discs over the years. I try to avoid them now. But I will buy ATOLL K in PAL if I can't find an American edition.
I enjoy UTOPIA / ATOLL K for Laurel & Hardy and don't mind it's cinematic faults. There is something so poignant about it, especially in Oliver. I'm sure you know what I mean.