I fired up Iridient Developer 2.2, and processed the M240 DNG images that I’ve been converting in Lr 5. There are several profiles available. I looked at two: one called RDv211 Leica M (Typ 240), and one derived from the DNG metadata.
The first yielded results different from in general, but substantially the same in the low ISO/push green shift as Lr 5, although I wasn’t able to test the ISO 200 image, since the most that ID 2.2 will allow is a 3 stop push. Adding a Ps Exposure layer above the ISO 200 image and setting it to + 1 EV yielded a pitifully washed-out result.
Using the metadata from the DNG profile produced essentially the same results as above.