I picked up the Lomography Petzval a couple months ago and have been shooting with in on a regular basis now. It is a recreation of one of the first "wide aperture" lenses ever created. While I greatly enjoy shooting with the lens, it is a very specific lens and I found my self using it only on a rare occasion. One of the primary reasons was that being a manual focus lens, it was much slower to use. This was especially true on my modern Nikon D750 as the D750 does not have a split prism to aid in catching focus. For that reason, I much preferred shooting it on my Nikon F3 film camera. I also found that the lens seemed to "mesh" well with film. Something about the old school look it gave images combined with the beauty produced by film was just wonderful.
I have included some portrait and wedding photos I have taken with the lens below, truly a unique look!
If you have any further questions about the lens don't hesitate to ask!