I have no reason to doubt Gen Asim Bajwa. In my opinion, whatever may be the rumors or allegations, the level of corruption in the Services in Pakistan is only a fraction of what is prevalent in the Civil Service.
I won't say that Pak Military is 'Lily White' because I heard tales of corruption by Gen Fazal Haq when he was Governor of NWFP ( now KPK) during the bigot Zia era. Arguably , that was all 'Hearsay' and the truth could be different.
I have personally not come across out & out corruption in the Army, even though while working Esso I have sold lubricants through DGDP Office in Karachi (Director General Defence Purchases). The only possible instance I am aware (if you can call it corruption) was when someone I know was supplying second-hand Alouettes to the Pak Navy many years ago. He flew the over the Captain & a Commander, responsible for inspecting & accepting the delivery to Holland on his expense so that they could inspect the helos before transportation all the way to Karachi to avoid the possibility of having someone finding faults at the receiving end.