I was really close to pulling the trigger on switching from my NX1 with 16-50mm S lens to the A7S ii, but after debating for awhile, I decided to just stick with my NX1. The big factor for me was that I've already paid for it and looking at reselling, it'd be tough to get anywhere close to what I paid (after selling fees on most sites or trade ins I'd be looking at like $1300-$1800). In order to pick up the Sony body and a decent lens, I'd likely be looking at around $4000. Even though I shoot everything in 4k, I usually downscale to 1080 since my primary audience is on YouTube and most watch from tablets/phones. I think you just really need to weigh what you're missing and ask yourself if it's worth the price of investment.