Yeah, the knife I posted here is very small. It's actually pretty damn sharp though, and I think it'll take an edge pretty nicely when it gets sharpened. Not really an everyday carry type of knife, but something I can take with me here and there when I feel like having something a bit more fancy to use. My main EDC knife is a Kershaw Launch, I've had it for a few months now and absolutely love it.
I know SAK's are really popular still, I definitely should try to get one sometime. I have a multi-tool from Leatherman that I just usually rely on when I need tools, but something a bit smaller would probably be nice for my pockets.
The genuine swiss knifes from Victorinox or Wenger are really not bad, and affordable too. The one I have shown is a more high end type and fairly big. I have also a typical red one from Wenger which is the size of a finger, that is ideal for everyday use. I have it for 25 years or so and its still perfectly fine.
I do have a mini version of a Leatherman, but thats a bit small as a proper tool. Similar size to your hummingbird knife, just with a number of different tools on it. Generally I don't use things like the Leatherman stuff. Its a bit over the top with all the tools, too much for the usual requirements. And if I need all those tools - I rather use real tools, they work better anyway.
In a way its similar with knifes: its best to use the right type for the job that needs to be done. And I have knifes for all kinds of jobs. The problem is just to know what job is coming up next. :)