I'd say buy now, but don't linger. Once mid-May hits, it's too late because then you only have 4 months until the next one comes out. Since you're coming from a Sony phone, I'd say definitely go for it as they aren't very good phones.
I got my 6+ on Sunday and couldn't be happier. Screen is huge compared to my previous 5, but I like being on the number release and not the S releases. S is just more of the same, but faster/better. I like getting the new designs every 2 years.
I got my 6+ on Sunday and couldn't be happier. Screen is huge compared to my previous 5, but I like being on the number release and not the S releases. S is just more of the same, but faster/better. I like getting the new designs every 2 years.