This is the finest bizarro Euro-exploitation piece that I have seen in a long time.
Certainly, Quentin Tarantino is a fan of this wild 1973 Franco-Spanish co-production starring horror legend Paul Naschy. Few films can successfully combine a botched jewel heist, a brain transplant and a mysterious character known only as "The Sadist." Naschy's role, though pivotal, is actually minimal, with few lines and only a few key scenes. The real story is played out by a gang of motley character types, of which the females are especially malicious and memorable.
Crimson has the right combination of impossibly contrived storyline and dazzling color visuals that one looks for in this kind of movie.
The Image Entertainment DVD (for sale on Amazon, though not linked to this page) is a sharp widescreen print, with a few nifty extras, including the alternate "erotic scenes" (not featuring Naschy, but the switch over to the bad body double is hilarious!).
Highly recommended