Hi, can anyone comment on how the Metz 54 MZ3 compares to the SB600 & SB800? At some point I want to get an SB900, but for now, I have a MZ3 with Canon foot, which I could replace for a Nikon foot, but don't know how well the flash exposures compare to those from an SB600 / 800. I can't also find an easy comparison of how the SB600 compares to the 800. Sorry if this has been covered elsewhere, but I haven't been able to find it. Thanks!