I am researching MC-E optics as well, looking particularly for RGBW optics. What I have found so far:
Ledil Eva (C10684), 16 deg
BOOM-MC-S (C10569), 20 deg
BOOM-MC-M (C10570), 28 deg
CA10944_RGBX-MC-M, 26 deg
CA10861_Iris, 11 deg, and
CA10953_Iris-M., 30 deg.
Fraen FRC-N1-MCE-OR, 10 deg...