@internal, Please take the liberty of driving all 3 cars that have been mentioned in the topic. Mark-X, 3 series and 5 series. Mark-X feels like a nice unclish car fairly responsive and speedy. To me it feels/looks like a glorified RWD Camry.
On the other hand, the 3 and 5 series are exhilirating to drive, handle like they're on rails. The build quality is far superior and much more premium than the poor plasticy Mark-X. Infact compare it to all Lexus models like LS, GS, IS, ES (I'm talking about Lexus badge cars not Toyotas)-- BMW build quality feels far more premium.
Now please don't try to make a comback by saying "Toyota is the worlds #1" automaker. That is pointless; what sells most is not whats the best.
When you have hands on experience with the cars, let me know I'll reopen a discussion with you