Just got this lens to use with my 5D. I've only shot a few test shots inside the house, but so far I'm very impressed with it. The MFD seems much, much closer than 7" or whatever it is, especially in manual focus and cranked all the way to macro.
I got this primarily for nighttime landscapes and astrophotography, hence the f/1.8, but I can tell this lens is going to be a lot of fun with the wide angle and macro combination; the depth of field is much thinner than I imagined it would be at MFD and f/1.8 for such a wide angle.
Also, no focus issues that I can tell so far. I haven't done any extensive testing, but close-range f/1.8 looks to be focusing where I tell it to, and so far appears to be pretty sharp.
The build quality is also very nice, solid, and smooth.