When it comes to the hospitals, you will find a lot of different opinions, however I have a pretty good personal experience with most of the Karachi's top hospitals and I found AKUH pretty good, yes it's expensive but better then others, I recommend if you want to have a detailed checkup of yourself then you should visit AKUH and you won't regret!
I did have few bad experiences with AKUH as well, but they are far less in scale as compared to other hospitals!