The image quality is perfect, even at full frame there are sharp resolution - not just off the M9, but also (via adapter) at the Sony A7R (yes, the lens itself is the screaming for good lenses 36MP sensor justice!). The Bokeh is beautiful, look and feel are amazing thanks to the metal. Of course, the lens is slightly heavier than plastic lenses, but that's not necessarily only disadvantageous. Especially since this lens is certainly often used for portraits, some weight to stabilize is even beneficial.
That this lens like all Leica M lenses no AF has, each should already be clear before buying yes.
