the 950 had lots of problems with banding and dark edges,the 2016 models are a big improvement,i see none of these issues on my b6,the new sets are brighter and definitely worth the extra.
i never had a problem with motion on my gt50 plasma,but the oled is better i dont get the complaints at all,it was one of the things i worried about when i ordered the oled.
i have replaced my panny 50gt50 with the lg b6 oled and it beats the panny in every area,bright whites,colours,black is just completely black,the image is also super clean and punchy,superb tv.
the large screen oleds have a lower yield,hence more expensive,last years 65 inch oleds are meant to drop in price soon at currys before the new ones come in.