First off I wanna say one of the things I absolutely love about AKG products is their ability to capture low-end. However I will admit that at times it can be a bit too much...
I run AKG 480's
and Schoeps (CMC6>4's/41s), depending on the room and a number of other variables. Each mic has it's place. I *love* the AKG cards XY when I'm *way* FOB, like 10th row or closer. Schoeps sound way too thin and nasally when run XY, and XY is the only way to go when that close to the sound source, IMHO.
I run the Schoeps hypers DIN from the OTS at big arenas and the Schoeps cards at good to great sounding indoor venues when fairly close to the sound source. Schoeps/AKG cards outdoors depending on distance and upon band.
Anyhow, running XY will roll off some bass response as will running the hyper pattern. Experience is the best teacher. After a while you will get a feel for what mic config to run (XY, DIN, ORTF etc.) as well as which polar pattern (card, hyper) to run in any particular situation.
It truly is as much an artform as it is a science.
Some general rules concerning polar pattern:
the closer to the sound source you are, the larger the pickup pattern should be. (cards, subcards, omnis)
The further the sound source, the tighter the pattern. (shotguns, hypers, cards)
Some general rules concerning mic configs:
The closer the to the sound source the smaller the distance between mic capsules should be (XY, DIN, ORTF, NOS)
The further the sound source, the greater the distance between caps (NOS, ORTF, DIN, XY)
I might also suggest you look into picking up "Stereo Microphone Techniques" by Bruce Bartlett. A wealth of info concerning mic set up, mic patterns etc. Truly illuminating! Have fun and trust your ears!