In fact those blue corners normally aren't even visible even on dark scenes.
Bottom Line: So far, of all the 1080p projectors tested, the only home theater projector with list price under $4000 that does have a real black level advantage, is the Epson. I do not believe any of the other 3LCD or DLP projectors can match the Sony. As to other LCoS projectors, well, there really are only 3 others under $10,000. The least expensive of those are the Sony VW60, and for just slightly more than the VW60, the JVC RS1.
For a brief explanation of the relationship of black levels and shadow detail check out the first couple of paragraphs of this same section, from the recent Sony VPL-VW60 review. This link will take you to the Image Quality page of that review. Just scroll down to the shadow detail section.
Here are a number of images found in most reviews, and a couple comparisons.