I would site the stats on the leg room between the different cars; however, it appears that information must be flawed as KBB.com claims that there is more leg room in the Lexus than the BMW. Well, I guess when they are at the dealerships, go there and test drive one. Its the only way to be sure. I'm sure the Challenger will have sufficient room for your needs.

The point of bringing up rear leg room is more a point that in many coupes vs. sedans that they are related to, they move the seats back a little to provide the front seats with extra leg room since they are less likely to have rear passengers. That is why I brought it up.