Edit: I just tried all kinds of gestures for closing image preview, and apparently swiping up now works! The update today said something about this, so wefwef all the way for me. It also just added top day (and top hour!) the best app on all fronts so far.
Wefwef is the best in many respects - but the inability to press images to close them is almost a deal breaker for me. The back button takes me out of the feed and into the side bar, with the image still opened on top.
I'm not gonna press the x in the top right corner every single time, it's bad UX, my phone's too tall.
Connect for lemmy has this functionality right, it's just ugly looking in my phone (the images in the play store look so nice, I suspect it's a bug with my specific phone)
Looking forward to Sync - it showed me UI with UX I hadn't even considered requesting. Sync just got everything right for me.