Not really looked at the new 5 series but amazed at glance how the interior doesnt look at lot different to an E9X. Seats are prob the same too. I can see why you might think the 5 is "the same old thing".
I think the Audi looks nice, I like the look of it and can see why you fancy a change. It wont be forever and you can always come back to a beemer in a few years, if you feel the need.