Having just received this FREE from Sony promotions for buying a Sony PXW-X70 I am assessing its picture quality over the GoPro 3 plus.
Firstly can I add that you have far more presets via the GoPro menu than you do over the Sony. The GoPro can be set for UK frame rates like 25p and 1080 50p while Sony have taken the lazy mans menu and made it US frame rates as default but thanks to my readers I have managed to worm my way through the menu system to change it to PAL, this can all be done on my iPhone via the GoPro !
I do like the monitor watch but you soon get to realise the iPhone is a far better viewing tool.
I think the GoPro 3 plus has many more advantages over the Sony not to mention the far more sophisticated menu system via your smart phone.
Even comparing the two cameras underwater housings the GoPro 3 plus is 40m while the Sony is only 16m. I do find that many cameramen/women become blinkered in the world of everything must come from the same manufacturer but there is no comparison between these two products the GoPro 3 plus is streets ahead.