Watched the whole of 4.1 now. Wow. Really feels like they never went away. The tone, the style, everything feels exactly like it did before. The use of music is particularly great still. The way it cuts around, drops out, changes volume, it's really, really good.
A few duds, of course, the worst of which was the End of Level/sub boss sketch, but by and large that was a joy to watch.