50 Shades of Grey vs. The Story of O?

I'm curious, for those who have read, and enjoyed, The Story of O.... what did you think of 50 Shades? I haven't read the latter, however, I'm interested. But I'm worried that I will be disappointed because of all the hype, being someone who isn't really shocked by much.
I wasn't shocked by O at all, and I'm afraid that 50 Shades will pale in comparison.