Comparison of V6 diesel with W12 and possibly V8. Driving feeling, performance, usage and maintenance

Evening people, I would have a question to which already diesel and petrolef have driven in Phaeton. I myself have recently been owner of a 3.0 tdi gp2 and mega satisfied. Just I wanted to ask if there is also who has a direct comparison between 3.0 TDI and W12? Wouldn’t the extreme example however 3.0TDI and V8 would be good greeting Dennis