As we learned few days ago Cgerrard is finishing his latest Sony articles before to stop to work on AlphaMountWorld. He just posted a Pentax K7 vs Sony A700 comparison. Read the 4-page long review at http://www.alphamountworld.com/photography-articles/pentax-k7-vs-sony-a700-comparison
Another comparison is available at artaphot.ch. They compare the A500 vs A700 vs A900 vs Dynax 7D.