This is caused by heavy background activity. - the reading curve in a PIE/PIF test is not affected whatsoever by disc quality AFAIK. Oh one exception: if PIF errors really get in the stratosphere, sometimes the drives does slow down, but it's a totally different case than what we see here.
@kyrcy: The MCC004 burn looks like if the disc was scratched, or have dye defects, or specks of dust. It's still a "good" burn, though.
About the MBI, you should re-scan this disc and make sure you have only moderate background activity while scanning it (avoid virus scanning, HD defrag software etc...)
Now about your original question, if it's "normal" to have better results with the TDK-branded MBIPG101 R04 than with MCC004, the only thing I can say is that these TDK discs are among the very best discs available at the moment, and I'm not surprised that they could outclass MCC discs, depending on MCC batches and the burner used. :iagree:
Are your MCC004 discs Verbatim-branded, BTW?
Also, were these discs burnt in the Benq, and at what speed?