But differences may arise across your group of 9 enlargers due to a variety of variables including alignment, focus, lens, negative, negative flatness, contrast/filtration, print processing, safelights, print viewing conditions etc.

You also need to define exactly what it is you mean by quality in the first place.

If someone perhaps less experienced reads the thread, how can he/she come to meaningful conclusions without knowing how the tests were done and how the results were evaluated? What if someone else fails to see what you see? Who is correct?