As PCM2 said, a few people will be saying they think it'll be too blocky without having seen it. I know that is true of myself - my 22" to 24" experience suggests that 27" @ 1080p would be too low a pixel density for me, but I've never tried it so it's conjecture.
You're currently using a display at ~ 90 PPI, a 27" 1080p monitor would be 81.6 PPI so noticeably more jaggy but not a huge difference.
For comparison a 24" 1080p is about 92 PPI (indistinguishable from what you're on) and a 22" 1080p is about 100 PPI (noticeably sharper, probably slightly too high for my liking on normal text).
Honestly though these numbers tell only a small part of the story, trying it is the only way to know for sure.