There are now Resolve FX, Sharpen, Soften, Edges,... nodes, have tried a bit with them, but not fully.
Some time age I was quite happy with a primitive trick in Resolve for C300 HD to 2K DCP upscale looking more "film like"
1st node Blur 0.55 + opacity of the node 50%
2nd node Blur 0.47-45 (sharpening)