The ViewSonic VX2235wm also uses the CMO M220Z1-L01. The Chi Mei CMV-221A is the VGA version of the CMV-221D. The panel may have input lag after all, as LesNumeriques did measure some.
Just to let you know, your OP is going to get long because the 22" market is about to explode.
Something's missing from this thread. No, not cowbell, rather Chinese measurements.
Sceptre X22WG-Gamer measurements (lcd.zol.com.cn):
White level: 198 nits
Black level: 0.31 nits (contrast 635:1)
Color gamut: 75.6% (sRGB=72%) NTSC
Uniformity (center/corner): 1.12/1.19=94%
The black level is average, but color accuracy on midtones is decent. Bright colors are a little less accurate. It does have more backlight bleeding than usual.
BenQ FP222W measurements (lcd.zol.com.cn):
White level: 163 nits
Black level: 0.32 nits (contrast 515:1)
Color gamut: 75.9% NTSC
Uniformity: 1.27/1.49=85%
I assume the BenQ also uses the CMO as the measurements are pretty close.
ASUS MW221u measurements (lcd.zol.com.cn):
White level: 163 nits
Black level: 0.28 nits (contrast 578:1)
Color gamut: 76.7% NTSC
Uniformity: 1.19/1.37=87%
The color characteristics of the LCDs that use the CMO 22"w are quite consistent. Backlight bleeding however seems to vary a ton. Some have lots, some have virtually invisible bleeding. On all the models tested above, uniformity varied less than 15% from the center to the corner. One important thing to note is that it's pretty dark for an LCD panel. The BenQ and ASUS hit 163 nits max, which isn't bright at all for an LCD (CRTs are around 85-125). The Sceptre hit a little higher at 198. Keep in mind the ViewSonic VX2025WM reaches 264 nits, and the NEC 20WMGX2/Dell 2407 reach about 470 nits. That's actually a good thing though. You don't need much calibration if it's already at 160 nits. That's a pretty comfortable level at which to use a monitor.
Here are some more links:
Westinghouse LCM-22w2:
WSGF
Samsung 225BW:
WSGF