... a tilt shift lens comparable to the CANON 24MM TS/E L II. Something that would replicate the same effect for real estate and architectural shots.
The second item I linked is a speed booster.
I cannot vouch for the combo personally, nor would I expect the quality to be quite competitive with one of Canon's best on its native system. However the Metabones speed booster white paper explicitly recommends using the Canon TSE 17mm f/4L on a micro four thirds body, which produces a 12mm equivalent image. It's an extremely expensive combination when paired with the EF active speed booster, but it is a possibility nonetheless.I didn't know they were "tolerant" with off axis light (as occurs when shifting) without distortions, the ones I've seen are soft around the edges when the optics are on axis anyway. Still, if its a combination you've used and can vouch for that's good. Do you have any example images?
...However the Metabones speed booster white paper explicitly recommends using the Canon TSE 17mm f/4L on a micro four thirds body, which produces a 12mm equivalent image
Fast/Wide Tilt-Shift Lenses: Canon and Nikon have recently made major upgrades to their fullframe tilt shift lens offerings. The Speed Booster allows these phenomenal lenses to be used on mirrorless cameras without losing their field of view. For example, a Canon 17mm f/4 TSE now becomes a 12mm f/2.8 ultra-wide tilt shift for either the Sony NEX or Micro Four Thirds platforms. What’s more, the full range of adjustment in the tilt shift objective can be used even after the Speed Booster is attached.
... but it is a possibility nonetheless.