I have both Sky and BT. BT is so far behind Sky it is untrue, from the production to the presenters.
That's what 20 odd years of experience buys you.
Word in the industry was that Sky were quite happy to lose the CL as so few people actually watch the games that don't feature English teams yet they still have to cover them.
But make no mistake, BT are scaring Sky. They have so much money to throw around its untrue.
The other strong rumour going around was that BT actually outbid Sky on every package for the PL rights. The only reason the PL didn't give it all to them is that they see Sky as a guaranteed long term partner, where BT might disappear like so many others have before.
Next time around that might change a bit more as BT will have been doing it a bit longer.