I think the only way that you can really tell how good the black level of any television is, is to read reviews by reviewers that you trust (other than buying a bunch of TVs and calibrating them). Also make sure that the reviewer has calibrated in the same way that you will calibrate. If the TV has horrible black levels out of the box that can be made great only with professional calibration, make sure you are willing to pay for professional calibration.
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I think the only way that you can really tell how good the black level of any television is, is to read reviews by reviewers that you trust (other than buying a bunch of TVs and calibrating them). Also make sure that the reviewer has calibrated in the same way that you will calibrate. If the TV has horrible black levels out of the box that can be made great only with professional calibration, make sure you are willing to pay for professional calibration.