You are using a high focal length, which means a narrow field of view. Those bricks are probably (in real life) 4 to 6 inches wide. Or maybe they were 2 feet. I don't know. But you've  got them wildly bigger than they really are, given the size of a car.

Matching the scale and perspective of an environment sphere image is a tricky thing.

If you choose a focal length that causes only 10 degrees field of view, for example, then you are looking width-wise at 1/36th of the full panorama. Suppose the image is 8K by 4K. (I don't recall what the dimension is of that particular image, so I'm just using an example.) Zooming to 1/36th of that means you are filling your "background" using only 222 pixels out of that 8K. Render that in a 1000 pixel wide image, and you have almost 5x blur.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)