[Leica] High Res M9 Portrait (how sharp is sharp enough?)

[kyle cassidy on the LUG]

In reading lens reviews I’ll often see something like “this portrait lens really starts to shine at f5.6” and I think “f5.6? who in their right mind would ever stop down to f5.6 with a portrait lens? Open it up all the way and solder down the aperture ring." But then occasionally I think “eek, my DOF is a little narrow there” and I resign myself to the possibility that, occasionally, f4 is warranted if you want to get both the lion and the gazelle in focus. 

Not that I’ll likely ever do it, but I’ll accept it may be true.

Here’s a high res portrait that may or may not be sharp enough.

http://www.kylecassidy.com/lj/2014/stars-flower-high-res.jpg