Improvements of E3D 6 over E3D 5?

Can someone tell me what has been improved in the E3D version 6 when compared to the E3D version 5? I know the size as changed, but what else? Is that all? Has anyone used both and can say which one performs better?

Here is a photo showing the size difference. Pretty impressive!
https://lh6.googleusercontent.com/-X...8+23.27.11.jpg

Hugely improved method of securing the thermistor. Instead of taping it on with Kapton it's now secured with a screw.

Internals have been modified to allow a bowden to be inserted all the way down through the heat sink to the heat break. Minimises friction through the hot end.