A better sampler for Qwen Image 2.1: DPM++ 2M with adjustable denoised-history sharpening.
https://github.com/envy-ai/ComfyUI-DPMpp-2M-Sharp
git clone https://github.com/envy-ai/ComfyUI-DPMpp-2M-Sharp
comfy node install dpmpp-2m-sharp