@stefanq said:

That doesn't look to me like a correct mapped hdri image. Doesn't matter if it's big, small, blurred etc. You probably mapped it like "spherical" as type, and it's not a spherical map. Try "angular" instead. Notice that you cannot zoom in the HDRI. It's like you try to make some objects in an image to look closer. When you choose a HDRI, think about your camera position in the scene, how far you are from the object you're rendering, and try to find a HDRI image with similar shooting conditions.

Finally, almost 2 weeks...
I've a little bit understanding about HDRI. I try to browse some free "spherical HDRI map" and match with my model, then apply it to my environment. I get a better result. But, I just thought HDRI was not one of the best environment setting, there is many ways to do it. 😄

Thank you so much guys...
Thank you stefanq...

Jr