>>4398231$600 for an x-t1+35mm f2 is hardly a steal, kind of a normal offer, if not a tiny bit on a high side. Back when I've upgraded from X-T1 to X-T2, I clearly remember being amazed with a bump-up in high-iso performance, but also being very annoyed with how unpleasant X-T2 AWB is compared to X-T1. X-T1 has very pleasant 'default', colors are nice and warm, it kinda automatically gives your photos amazing warm gold tint during golden hour. X-T2 is kind of all over the place, most of the time AWB was setting a weird purple tint that was often so bad I though I have a malfunctioning model.
But between two, I use X-T2 nearly all the time nowadays, despite having both in my drawer right now. Setting manual white balance is quick and easy, you just have to take a photo of something relatively neutral and set it as custom WB, 24mp is sharper/gives you more wiggle room to crop, and then X-T2 is way faster in UI, plus it takes high iso like it's nothing compared to X-T1. I'd say it's a very decent upgrade, worth extra money, though unless you're aiming for some mint condition samples, you might want to look for better offers.
