4K video overheating, not anymore.

So we all know that the Z3+ would shut down after a few mins of recording 4k
Videos.
I work at O2 and we just got our Z5's in stock.
I managed to record 4k video for over 30 mins and the phone only got warm. Which is really good! Whatever Sony have done, they did a good job and I salute them! Definitely getting this phone asap!