Totally agree with jam2000. I have both Sky Q and BTTV and the uhd on BT is superior to sky's uhd picture, also the hd channels are at the very least on a par and in my opinion better (of course live sports are also reliant on the country's feed so hard to judge at times but the PL is excellent quality).
There are lots of conversations about like for like but most of them always agree they are close, from what you say there must be an issue with your setup.
What tv do you have. Looking at the forest green match now is superb. F1 on sky q has always left me flat in comparison. Did you have uhd on sky or gave you never actually watched uhd from a stb.
What model Samsung, what hdmi port and what are the info settings that cone up on the Samsung tv when watching 433. What output are you on in the uhd stb settings
You have something setup wrong then because I have both and watching them now BTs 50fps picture is superior to Skye's uhd picture. Can you answer the other questions and we can see if we can find the problem.