I've been using the N660P as my daily driver, and I love it. The N660P can shoot 60 FPS but only as high as 1080P. This new N950P can shoot 4K (and the footage looks great through the Sony lens), but there's no 60 FPS option, only 30 FPS.
The quality of the footage is Very Good - the Sony sensor really makes a difference!
Digital Zoom works well (it only works in 1080P though - no 4K zooming).
The N950P comes with a remote, which allows you to on-the-fly adjust things like brightness, zoom, mic level (if you're using the on-board mic), mute the mic, turn off the video, turn the BLC (Backlight Compensation) on or off, and switch the frequency between 50Hz and 60 Hz.
The instruction booklet is not quite as detailed as I'd like. For example, it tells me that the BLC button on the remote turns the Backlight Compensation on and off, but it doesn't tell me what the BLC does, why I'd want it, etc.
The remote interferes with my softbox light, which also has a remote. If I turn the softbox off with the remote, the camera turns off too, and vice versa, which makes for some tricky maneuvering when making adjustments.
There's no indication as to what settings the camera is currently set to. For example, if I press the "50/60HZ" button on the remote, if switches the frequency... but there's no indication as to which frequency it's currently on. Did I press it? Is it on 60Hz now, or is it on 50? The only way to be sure is to press the "Home" button, which returns the camera to default settings (default is 60Hz)... but that returns ALL settings to default, so if you've adjusted anything else (brightness, etc) you need to start over.
These small shortcomings are certainly not a deal-breaker, and once I got used to them, I was really enjoying this camera. For me, the quality of the lens and the footage far outweigh the inconveniences I've mentioned above, and I think I'll be using the N950P as my daily driver now... Did I mention it shoots in 4K with a Sony sensor!!!
Hope this helps you make your decision...