Apple earlier this week cut the prices of its Retina MacBook Pro laptops by as much as 13 percent, a move one retail analyst said was driven in part by increased competition from higher-end Windows systems. On Tuesday, Apple refreshed its MacBook Pro line, reconfiguring the laptops with the latest Core i5 and Core i7 processors based on its Haswell architecture, replacing previous chipsets with an Intel graphics processor dubbed "Iris," and putting the new models on a modest diet.