Tomochan,heads up I wouldn't change either unless the March absolutely had what s&b did not, like a lot more zoom. For my eyes s&b glass is as good as it gets. Where I test glass is in brush and s&b gives me depth perception all others don't. This feature is eye specific as some guys will find other brands give them better depth perception than s&b. This little subtle difference makes a huge difference when needing to judge distance differentials quickly and without external aids.
Exactly!