So it is time for some initial impressions. I did some side by side comparisons with 34UC98 with my brother's PC (G4560/GTX 1050) as I wait for long DP cable to be delivered tomorrow so I can reach my own PC (6900K/RTX 2080 Ti). I have a lot of things there, including some HDDs on the loose and everything cooled with AIO, so carrying all of that through a narrow attic ladder just for one day is not a good idea.
Color: UC98 has a bit better out of the box setup because
950G oversaturates the picture and there is no sRGB preset available. This however is not a bit issue after some adjustments, and you can always decrease saturation in games by other ways than monitor's OSD\
Brightness: 950G is brighter by a good margin, 100% on UC98 is around equal to 950G at 80%
Sharpness, font, etc: both displays are doing a great job and are basically equal. Font is sharp and picture looks very clean and natural, the opposite of all available VA ultrawides. 950G has noticeably less DSE than UC98 when scrolling though websites with bright backgrounds, basically none at all
Blacklight bleed: similar for both. 950G has a bit more in left bottom corner, but this is noting unusual for a display of this type. I have seen much worse
Glow: and here we get to the very bad part. Glow is ridiculous and what is the worst part it is very intensive even when the screen is viewed from up front with most optimal viewing angles for real usage. There is a massive difference in how the screen behaves from different sides, from the left is looks good and better than UC98 in terms of glow, but when looking from the right it has ridiculous glow. Don't know if this is a flaw of this particular unit or if this is characteristic for this panel, but it looks very bad. I see the same behavior like on some old poor 3800R ultrawides like Dell U3415W or Asus PG348Q, you can sit exactly in front and you will still have most of the screen covered with yellow glow. Something that UW3 panel from LG UC88/98 solved very nicely with just a little bit of silverish/blueish glow, consistent from both sides, as good as it gets on ultrawides. 950G is back to the terrible yellow glow from old 3800R panels. I doubt exchanging a unit will help here, it never did with these 3800R ultrawides, so why now. I will contact the shop and see what they can do, but it is extremely unlikely that exchanging for a new unit will help.
Aside from that the screen is very good and a worthy upgrade from UC98, but this glow is far from acceptable or usable.
I also tested G-sync for a bit, playing Warframe at 3440x1440 on my brother's PC was obviously not great with performance and fluctuating around 40-50 FPS, which is exactly the best way to test G-sync. The difference is amazing, lower framarates look way smoother. Don't know why I didn't get G-sync earlier.
Some pictures:
Here is bleed, from 2 meters away
So no major bleed, not an issue
And here is glow, from 50 cm distance:
I am literally having deja vu from 2 units of Dell U3415W that I have tested 3 years ago. The same thing exactly, slightly darker scene appears and everything is already covered in yellow glow.