I know that just a couple of days ago we tested out the best sampler and scheduler for Z-image, but... AI develops so quickly. Why do I say it's an exclusive scheduler for Z-image? Because it's the one used in Z-image's official demonstrations - FlowMatch. However, no one has recommended it, and it's not even in the default options list of ksample. This made me a bit curious, so I found it and conducted a series of tests.
The test prompt comes from:
https://civitai.com/models/2181458/amazing-z-image-workflow
Now, let's get started!
At first, I used the classic Euler + Beta combination for a comparative test. The performance of FlowMatch on the right side wasn't particularly remarkable; the background seemed to have a bit more detail, but only a little. However, I preferred the texture of the leather jacket on the left side with Euler.
It wasn't until I tested this image that I noticed some differences in FlowMatch.
The prompt mentions: Yellow spheres are scattered on the ground.
Looking at the image on the left, doesn't it seem too deliberate? The one on the right is much more natural. This reminds me of the previous comparative test between FLUX2 and Z-image. The images generated by FLUX2 often appear more natural, precisely because objects are distributed naturally like in the image on the right. Back then, some people concluded that FLUX2 is better than Z-image, but now it seems that this conclusion was a bit hasty. To prove my judgment, I conducted a series of additional tests.
Yes, my judgment seems to be correct. The control panels are arranged in an orderly yet not rigid manner, and the ducks are not standing in neat rows. FlowMatch has disrupted this order, which makes the image look closer to the life we are familiar with.
Immediately afterward, I conducted a comparative test using the optimal combination scheme for Z-image that I had tested before: DPM++2m+sgm
The image on the right clearly has much brighter colors, as if the contrast has been increased, and the tip of the frog's nose is even slightly overexposed. The details in the画面 are also richer, such as the texture of the spherical aircraft where the woman is standing.
By now, I believe you already have your own answer in mind regarding how to choose. Finally, let's talk about installation and usage.
https://github.com/erosDiffusion/ComfyUI-EulerDiscreteScheduler
It is installed in the form of a node. You can find it in the manager, or directly download the file in the attachment, unzip it to your “comfyui\custom_nodes”, restart comfyui, and then you can find it in the scheduler options of ksample. Select this scheduler and run it normally. Oh, by the way, in my tests, it works well with Euler_A, so it is recommended to give it a try.
The full images of this test are also placed in the attachment for your testing use.