Hi, would like to seek advise from the bros here on whether I should upgrade to 5D2 or not 
Am currently using 7D and have the following lens or in the near future.
1) Sigma 20mm 1.8 / Canon 20mm 2.8 ( Still deciding )
2) Sigma 50mm 1.4 / Canon 50mm 1.4 ( Leaning towards Sigma )...