What do you have against the semis? I’m in the market just looking for opinions.
I've had a couple of the semis, a 2010 CU22 Semi, and the current model Special SH. They're great guitars,
Since you ask...
They have their own vibe compared to a solid body or full hollowbody, and they're also different from a Gibson 335 which is also semi hollow, even though it has the look of a fully hollow guitar.
There's a little less bass and 'oomph' than a solid body, but the upper-midrange has more resonance. I think that's what makes the guitar sound different from the fully solid models. The highs are comparable, but the guitars sound brighter because there's less bass and lower-midrange.
A 335, because of its plywood construction, with much larger cavities on both sides of the neck, is something altogether different, and to me, closer to a hollowbody in tone than the Special SH.
For some players, they're an ideal compromise between a fully hollow electric and a solid body. For others, they're neither hither nor yon.
I liked the two I had. You might wonder why I sold them: One, I sold to help fund a private stock model. With the more recent one, I simply had the hots for a DGT; I plan to get another one, because I do miss it.
If you're more of a solid body aficionado, get the 594 you mentioned you were interested in. If you want a fully hollow tone, go that way. If you want something that has the spice of a little of both, the Special's a great choice.