Well lit scenes seemed OK, however the "performance review" scenes which were less well lit had what looked like camera noise.
It was certainly struggling with the noise and showed artifacts when viewed close up.
Not particularly noticeable from normal viewing distance.
Obviously without a direct A/B it's impossible to say what this looked like at the higher rate.
I've got plenty of recordings. I should be able to benchmark something. eg Wallander.
Agree with you on the noise and artefacts.
My main test is the wow factor. Look at it from a distance and see if I can say to myself its a great picture. At the moment - Life of Riley showing- it isn't.