Many thanks Toby - it's such a well photographed and.... 'unique' building so I wanted to get something a bit different from the norm. I also wanted to process the image to be on the cool side of neutral. Somehow seems to suit the building's character if that makes sense?
In terms of the lens, optically it's stellar. Yes it's sharp, (probably on par with my old Nikon 24-70/2.8 G) but it's certainly not clinical or sterile. (Macro lenses can sometimes be like that I find). I think a lot comes down to how the files are treated. Treat them sensitively (as I know you would do) and you won't have any problems.
The only thing I don't like about the lens is the twist to lock / unlock design (I can imagine this being a point of mechanical failure over time). On the plus side, it's very small, light and cheap (for the performance on offer).
The Z bodies work superbly for my needs. They are rugged, light, ergonomically well thought out and the sensors are absolutely stunning.
Hope this helps
Lefty