Well I am an MBA(IT)[+ Mechanical Engg.], and right now I am managing some 15+ people engg team. I can very confidently say that being an MBA has helped me a lot. It gave me an insight in being a leader and made my job of managing a engineering team easy.
However I started my career as developer and have spent 7+ years in developing complex systems. The one difference I could always notice was leadership/initiative distinction between me and other developers and I used to think why these guys are not able to manage their time and guide their juniors. Simply they were not able to think beyond code(I am not generalising but the pattern I noticed with obvious exceptions).