I just installed Beta. Was going to wait till it was released. I'd say 2x was better than DSR but far more taxing on hardware (might also be that there are more Ultra graphics settings in the game now though)
In the hangar. First thing I noticed is that the New SS removes a lot of the pixelation flashing on the edges of all those horizontal beams. They do shimmer slightly between pixels but no sparkling or specular streaking along edges like previously.
On leaving the start platform. I noticed the lighting is MUCH improves. A lot more general ambience and subtle glow outside (might be new ultra settings again) but there seems to be a bit more depth to shadows and it looks a little more realistic out there. Went for a supercruise to the nearest station. Noticed that the bumps on the planet were much more defined and natural with better definition along the shadow edge. Boring old corrolis station looked MUCH better. More crisp, less pixel popping, shadows much improved. Just looked more real.
Negatives. On my 970 with everything maxed, no AA and 2x supersampling (head tracking may pay a part too) I rarely get over 47fps except in deep space. Around stations with other ships or interior it was mostly mid 40's.
In the current 1.0 release. with Nvidia SS from 1440 down to 1080 the edge antialiasing between pixels is much worse as in, there isn't really any on those interior horizontal beam edges. The pixels really pop and look ugly. But outside you do get a lot more detail than vanilla 1080p.
So if you have a powerful enough GPU to do 2x SS it looks WAY better than ever before. (Maybe it will run better if I lower some new settings back down to high from ultra).
I wonder if they could do 1.5 or 1.75 SS. 1440p runs really well on the the GTX 970 which is x1.75 I think. (can't be bothered to check)