A good player will make it despite the instrument. I'm living proof of that (this is genuine humility, BTW!). I've never owned a guitar more expensive than my 1971 Yamaha FG160 and FG260 (6 & 12 string, respectively).

I have lesser-able friends with Gibsons, Martins, Guilds, Lowdons, Fyldes, etc., and I sound better because I play better.

Maybe if I could afford it, I'd buy something expensive... then again, don't fix what ain't broke...

Accordions - now that's another story...