Frank, it is the Canon S type from focusingscreen.com which I can highly recommend. Though f/4 is as slow as I would go with it, f/2.8 even for dim lighting
Jakov. Perhaps selective sharpening could help a bit, but this image suffers because the oof region is at an angled plane. I have noticed that I get particularly bad bokeh when the background is situated like this, it begins to look a bit "barfy" in my opinion. The higlights/etc. get distorted which really upsets the smoothness. I got as low as I could to knock the road oof more, but could only go so far before the road lines appeared in the image.