I know that we have some people here who has used those 2 lenses. They are the 1st version of both of them.

Now that the used version prices here in finland are getting into some reasonable values is there any major image quality difference with those.

Naturally have read the sites reviews etc. but would like to hear opinnions from you who have used those. Is the some hundred euros worth to go for 600mm image quality wise or not?

Kinda tempted to have more millimeters since i also love taking images of moon etc. but then again if the 500mm is clearly winner on image quality wise then could easily live with less mm but better quality =)