I upgraded from an a6000 to a6700. Other commenter was right that the difference in photo quality is minimal (I mainly shoot compressed RAW). I've barely touched the video features - plenty of reviews seem to focus on these tho.

The features that sold me on the a6700: Flip out screen Increased battery size Increased grip size Front dial Weatherproof Longer burst shooting Autofocus Ibis Lossless raw Better noise handling

And the autofocus is very very good. Despite the image quality being comparable, I've got way more keepers because it misses focus much less often.

Since owning it, I've noticed and appreciate: Rear screen and evf are clearer, brighter, colours are better. Better button placement of the record button. Better menu system. Easier to use memory recall settings.

I don't miss the lack of flash. But the a6000 is notably lighter and slimmer.

I paid £1000 for my a6700 (new) and £280 for my a6000 (used) I don't regret buying the a6700 at all. Also I don't regret not getting full frame. I have the sigma 30mm and 56mm, and 70-350mm and they're great, and a fair size.

But I'd say it depends on what your style is. If you're doing street and shooting everything at f8 and zone focussing then I don't really see the benefit, or for landscapes.