Each to their own, however, there is no evidence that the Planet X would ‘not loose any time on a 100 mile ride‘ to a F12. Just the improved aero-dynamics of the F12 (no external cabling for example) over the Planet X would cost the Planet X something .... over a few miles maybe not too noticeable, but 100 miles is some distance - 4 hours plus in the saddle. Pinarello claim the F12 is 1 minute quicker every 60km at 40km/h than the F10 - purely due to aerodynamic improvements ... and the F10 is no slouch