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best quality, 4k, 8k, highres, masterpiece:1.2, ultra-detailed, (realistic, photorealistic, photo-realistic:1.37), (Captain America:1.4), a heroic soldier in a star-spangled suit, wielding a shield, stands before a towering metallic city bathed in warm neon light. The city features towering structures adorned with shimmering panels and glowing orbs. Across the background, a vibrant art piece titled 'FLUXnf4' in bold, futuristic letters floats in the sky. Blurred city lights illuminate the foreground.

Edit: Here's a quickly written custom node to try it out, have not tested it extensively so let me know if it

ComfyUI_bitsandbytes_NF4

https://github.com/comfyanonymous/ComfyUI_bitsandbytes_NF4

ComfyUI\models\checkpoints\flux

flux1-dev-bnb-nf4

https://huggingface.co/lllyasviel/flux1-dev-bnb-nf4/blob/main/flux1-dev-bnb-nf4.safetensors