It doesn't have the biting sharpness unless you stop it down to f/8 or so, however, it is wonderful for portraits at wider apertures. My copy of the lens has a slight front-focus at f/2.8 and 1 meter away, but once I stop down to f/4, it is negligible.
I have not had any chance to go out to shoot at all, so I've been confined to just use my backyard the best I can, and in the house when the light is good. What I've discovered is that this lens is amazing for taking portraits. While I wouldn't hesitate to use it to shoot some flowers or landscape, I find it is simply amazing for portraiture photography.
Being a tele-photo lens, it is capable of producing pleasing bokeh to separate the background from the subject. Also, it's softer rendering at wide aperture is flattering for human subjects. I had previously loved to use my 50mm Summilux ASPH for taking portraits, and sometimes I do have to work a bit harder to get the beautiful out-of-focus background, but with the 90mm Elmarit-M, it is so easy. Here are a few more portraits of my son, and a shot of our pine tree to show its sharpness and nice color rendering: