Englands attack is lightyears above Australia. But I think Siddle doesnt look so bad when he doesnt have a bowler leaking 5 an over like Johnson as it doesnt take the pressure off.
Anderson is the best bowler between the two sides, and Swann is lightyears above Lyon. The biggest difference is in however the batting. If you picked a combined England/Australia batting lineup then Cook, Strauss, Trott, Pieterson, Bell would be the first 5 picked and Prior would be the keeper. Australia might get a sixth bat in there, maybe Clarke/Ponting (Who were both made to look village by england last summer).
Englands batsman when they go well score hundreds, australias batsman score 70s