It depends. If it's not highly stressed, it's a subtle difference, but quite a few I've 'liberated' were so stressed it made a big difference. Some are so bad that the vanes don't line up once cut. Sustained notes, such as in organ music, is where it's the most obvious.

Some folks prefer them with the vanes removed, or at least the two outside ones like some early W.E. lens, but HF dispersion suffers even more, requiring a super tweeter IMO.

GM