Today PentaxForums.com released a review comparing the Canon 7D and Pentax K-5. Overall I think it is a really interesting review for a person who uses either system. I think they tried to be as non-fanboy-ish as possible by bringing out the best and worst of each system.
Here is the review link:
It brought up the pretty well known differences:
– The 7D has great AF and video control.
– The K-5 has a great sensor and ergonomics.
They both have high build quality, weather resistance, fast operation, and a multitude of other similar features. Obviously both camera bodies would be a great photography tool to use if you can afford the entry price. I think it also explains why the K-5 came out around $1500 and has held a strong price since then.