For what it is worth I decided to take a brief look at Lee and Morrow who have been in the league the same two years, approximately the same age, and have in some strange way been "traded" for each other: or, we got one and as a result gave up the other. This came out of my and muwu's discussion over at his fanpost Are we overrating Anthony Morrow. I'm liking these graphs so I thought I should just throw it up.
click on the pic for larger image
They are fairly close in some of these fields, Morrow distinguishing himself into elite level when it comes to 3pt shooting, as everyone knows, but Lee doing not so bad with the 2 years. These are career numbers for brevity sake, since Lee had the advantage of playing on the best team in the East, and then disadvantage of the worst. For the 82game data I just averaged the two years since most numbers between years were close. By and large Morrow plain and simple is just a better offensive player almost across the board. Sometimes slightly, but sometimes by a substantial margin.
A few things are left out, like defensive numbers. Morrow actually from the data I have such as +/- or PER vs has the slight edge. Synergy Sports data has some skew towards Lee though (such as iso performance) which can be a finicky stat. Its seems pretty clear that Lee is a fixedly better defender than Morrow thus far one would have to say, no matter the stats, although Morrow was playing for Don Nelson who doesn't really bring out whatever defensive potential you have. Muwu has also raised questions about Morrow's ability to draw fouls which obviously hasn't been part of his game, but he had the same rate of FTs as Lee per 36, and questions about his hands/skills also resulted in essentially the same TOV% as Lee. As with all these things, none of this is conclusive as each small data sample measure has to be qualified, its just meant overall to present a sketch or picture. And of course, whenever compiling these things, there may be some errors.