I have an FSI 2461 and 55″ Penta in my suite.
They’re certainly very close, and I can’t say which is more accurate.. I’d be comfortable making decisions off either of them. For a large client monitor, it’s tough to beat. The Penta is too far away for me to be comfortable with it as a replacement/only screen, but I much prefer it to the Panny Pro Plasma it replaced.