Are PCs finally cutting into Apple's domination of the high end?

Given the recent discussion on Apple's earnings, this bit seemed to be interesting new data point:

"historically a new MacBook Pro has usually helped improve Apple's Mac sales significantly. The late 2013 model boosted overall Mac sales in its debut quarter by 19 percent year-over-year, the mid 2014 variant pushed sales by 21 percent, and even the recent 13- and 15-inch 2015 models both saw increases of around 10 percent in Mac sales in the separate quarters they debuted in."