Best generative upscalers similar to Nano Banana?

Hey everyone, ​I’m looking for recommendations on the best upscaling models out there right now that perform similarly to Nano Banana. (2k - 4k) output ​To be clear, I am not looking for standard AI upscalers/enhancers like ESRGAN, Real-ESRGAN, or Topaz Gigapixel. I don't just want something that sharpens edges or removes noise. ​I’m looking for true generative upscalers, models that actually look at the context of the image and smartly "guess" or hallucinate new details to fill in the gaps.