I fly the L4 with TRACS...can do more than the 407 in the hot and high environment.
I would be curious if you can elaborate on this statement. I have flown the 407 and L4 with the high altitude tail rotor in the CO mountains, based at an 8,000 foot airport with 14,000 foot mountains just a stone's throw away. While the L4 will be torque, rather than temp limited up pretty high, even a temp limited 407 seems to have gobs more power than the L4.
If you are talking about solely the performance charts, although I haven't had an opportunity to study it, I have sitting on my desk the new supplement from Bell with the 407 improved hover performance with above minimum specification power.
The 407 is just so much more capable in the mountains -- the FADEC keeps rotor RPM rock steady where the L4 rotor RPM is always climbing in descent, the boosted pedals of the 407 make yaw control much easier, the response of the 407 rotor system makes hovering so much more precise than the same day response of the L4, the 407 landing gear makes off airport stuff and especially slopes so much more comfortable, and the 407 has better range, climbs better and cruises faster than the L4.