On a serious not e I really am having a hard time picking.The only real way for me to make a decision is to narrow it down like this. I think the IS-F is a great car but not nearly as good as the other 3. If I had to get a 4 door I'd go with the Benz. But I just have a really hard time seeing myself in anything that has more than 2 doors so I'm gonna say bimmer.