Link to my workflows: https://drive.google.com/drive/folder...
Link to the upscalers database: https://openmodeldb.info/
This is a ComfyUI Stable Diffusion workflow where we can mix and match latent upscaling with image upscaling (by model). Good results can be achieved with 2x latent followed by 2x image-by-model upscale, but different combinations can be easily created by rerouting some node links, even an intermediate sampler stap can be added.