Doremus makes very good points. You can't make a 150mm wider.
I love my 125mm. I like it more than my 150mm. I often run out of rise on my 125mm, so when that happens I don't like it as much as I did up to that point. I have more than a few photos that I ruined by exceeding the 125s image circle. The corners in those shots are nicely vignetted. So, I could have walked back farther (sometimes) and cropped, or walked back a bit with a 150mm and used the more generous image circle to get what I wanted. Sometimes, however, there is no room to back up. That is where the wider lens makes a difference.
So much depends on what you photograph. My focus on the image circle is based on the things I photograph. I like to photograph buildings. I live in California, so I go to places like Kings Canyon and Yosemite where the trees and geologic features are tall and I don't always want them pointed in or out as they reach for the sky. If I lived in the midwest, and was not photographing buildings, the image circle would probably not be as important for me.
And he is right about the 135mm Wide Field Ektar. Plenty of image circle on that lens, a bit more than the image circle for the 150mm Fujinon NW that I mentioned above.
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