No, all economic metrics from the UK are positive at the moment with the exception of the currency, which fell because the central bank had announced it'd devalue the currency if the vote went the "wrong" way! The BoE policy looks pretty questionable now: their predicted economic armageddon didn't take place, leaving pundits saying "well it would have done if we hadn't printed lots of money", ignoring that the mechanisms used to print that money don't trigger real business growth so fast.

I really don't know where you get the idea that the UK is somehow totally dependent on the EU in ways Switzerland isn't. Switzerland is far from an island. It has massive trade with both the EU and the rest of the world. That's why the Swiss Parliament is desperately trying to ignore the vote - they know Brussels will happily wreck the Swiss economy if it doesn't get its way, even if that also damages Germany (German devotion to the EU is perceived as bottomless in Brussels, it seems). Switzerland would absolutely suffer if its deals with the EU were terminated, and it's laughably far from self sufficient.

WRT what Zürich lacks, just compare the wealth of cultural events, museums and shows in London to what's available in Zürich! Don't get me wrong, for its size it does pretty well, and there are many other things London can't match (like the lake life) ... but you can't seriously claim a city more than 10x bigger provides literally nothing more.