Quad Z-2 Opinions

Does anyone here have experience with the Quad Z-2 (2-way stand mount)? I accept that the ribbon tweeter will produce excellent treble response. I will be using a sub, so bass extension is not an issue. I mostly want opinions about the midrange. Is it fast and detailed? The mid/bass driver is fairly large at 175 mm=6.89 inches, so I'm wondering if the midrange ends up losing out to treble and bass.

I'm trying to decided between this model and the Wharfedale Evo 4.2. My current speakers are Wharfedale Opus 1 floor standers (3 way with a dome midrange). I like the basic sound, but the speakers are starting to show their age. 

Thanks in advance for any help.