B&W 801: Matrix s2, Nautilus, 801D deep bass response

I am interested in hearing if anyone has experience with side by side comparison of these 3 models:

B&W 801 Matrix series 2

B&W Nautilus 801

B&W 801D

Specifically, I'm interested to know which of these has the best bass response below 40hz. Official B&W website specs indicate the 801 Matrix Series 2 would, but I would like to hear from people who have heard for themselves.

Thanks