I haven't actually built anything with v5 yet to showcase yet, but judging by the release notes, there shouldn't be too much of a problem with rolling with 4.2. Naturally this will change as bugs and security glitches are found...
To me (as a relative newbie to laravel), the docs for v5 look quite impressive. Okay they are a bit wordy with not a great deal of examples, which I can really see as a problem. No idea how it compares to v4.2 in terms of general usage. This dude seems to explain the differences quite well. I particularly like the idea of queues built in, and the templating system looks pretty cool.
Out of interest, what is it that you personally find so different?