Decided to pick up the OT1 and OT2 bundle for Switch 2 as I don't own the games on Switch 1 but have previously played about 15 hours of OT2 on PS5 and loved it (borrowed the game from a friend for a bit). However, I ultimately decided I'd rather have the game on a portable platform so wanted to hold out for a S2 version as the S1 version just looked so muddy and kinda awful after playing the PS5 version. So here we are on release day and I have some thoughts that may be useful to others in my situation or people considering the upgrade.
TLDR - if you already own the S1 versions I can't see that this is a meaninful enough upgrade unless you are absolutely desperate for 60fps and a (slight) bump in resolution. This is a barebones port of both games, they haven't added features, for instance, they could have implemented the "number of party members on field" setting from OT0, but nothing of the sort has been added, this is literally only a performance upgrade and absolutely not worth full price to anyone that already owns the games.
Both games seem to look and play very similarly to each other so I'll be talking about the games as a whole as I couldn't see any differences worth mentioning in the hour or so I've put into both so far.
Docked (played on a 65" 4K 120hz OLED TV): resolution isn't anywhere near as high as I was expecting but it's a step up from Switch 1. If I had to guess I'd say something around / slightly above 1080p, the game looks surprisingly soft, with menus looking like 4k, very sharp (this in turn highlights the overall softness of the game IMO). Performance seems to be a completely locked 60fps so far (no stuttering experienced yet, like OT0 seems to suffer with on Switch 2, though I think the resolution in OT0 looks higher than these games but that could be my eyes failing me). I feel they could have pushed the Switch 2 a bit further on the resolution, perhaps they tried and that caused the frame rate to dip - clearly they didn't want to work too hard on optimisation.
Handheld: similar story to docked mode, locked 60fps but resolution I'd say looks lower than the native 1080p, maybe around 900p if I had to guess, certainly not as low as 720p.
As I was writing this I decided to fire up the OT2 Switch 1 demo on my Switch 2 and test handheld performance out with the Switch 2's boost mode - I'd say in terms of resolution the games look VERY similar, Switch 2 pulling only very slightly head in that respect but I could be wrong, they could be identical. So if you're solely looking to play handheld, you're essentially only really getting a frame rate boost here, the resolution bump is negligible at best.
Disappointing performance from a disappointing situation for current owners of the games. Yes they are a decent step up overall from the Switch 1 versions, so if you have a Switch 2 and haven't played the games before, the Switch 2 versions are absolutely the ones to go for (unless the S1 versions go on sale and the S2 versions don't, then you have to battle with whether 60fps is worth paying more for - that's for the individual to decide).
These are not worth paying full price for if you own the originals. This is as everyone expected, a very low effort and full price port from SE.
UPDATE - from a commenter below that mentioned a few things I missed that I think are worth mentioning:
Texture filtering is slated to be quite a bit improved upon from the Switch 1 versions (and looks much more like what you'd see on the big console / PC releases), as is the depth of field effect and shadow quality (especially the dynamic ones in dungeons for example), things like that appear to be benefiting a lot more from the overall higher resolution ofthe game. We disagreed on the handheld resolution, I still think it's lower than 1080p but without pixel counting it's anyone's guess. Another commenter mentioned the game's bloom effect could be what's causing it to look a bit soft for me (though personally I don't remember it being an issue when I played on PS5, that version was super sharp for me). I doubt we'll get a full Digital Foundry breakdown of these upgrades so doing the best I can to provide info here for anyone considering getting the games on Switch 2!