I recently just sold my G35 and have placed an order for a '13 M3. I still love my G35 and always will, I just told myself it is time to move on. My G35 made 470whp and 570wtq and was quite tastefully moved. Nothing stupid, it was all function over form. Sorry but my G would romp on most M's here, the M's I've test drove don't come close to how my G felt and that is what I will be missing the most. It shredded tires all the way through 3rd gear.
I'll admit, the G35 is a lower class of car so of course you're going to get younger kids who don't know anything and act like douchebags, but believe me the majority of longer owners are not like that. There are idiots and douchebags in all different brands of cars.