If the AL CY was about quality vs. quantity, the NL CY is about a detailed comparison of 2 great seasons by starting pitchers. Relievers Fernandez and Cook both had extraordinary seasons, but unlike Stock in the AL, were used primarily (or maybe exclusively) as closers - they have their own award and didn't throw enough innings to approach the "weight" of the starters. And Dover's Gaudin, even though he had a fine season, didn't approach the heights Branson and Johnson reached. Our NL CY call is between Branson and Johnson.
The CY Case for Rick Branson: Hit the magic 20-win mark with very good qualitative stats: his .622 OPS-against (neutral ballpark) is a pretty spiffy mark.
The case against: Didn't quite reach 200 IP (although Johnson didn't throw many more).
The CY Case for Joe Johnson: Better qualitative stats across the board than Branson (a full run a game lower ERA and an excellent 562 OPS-against) in essentially also a neutral park (ever-so-slightly more pitcher-friendly than Branson's).
The case against: Only 15 wins.
To me, it's a miracle Johnson managed 15 wins. The Sewer Gators only managed to score 571 runs the whole season - last in the NL by a wide margin (no knock on mbriese whatsoever here...I actually admire the way he plotted a bold pitching-and-defense strategy and put it in place), while Branson benefitted from Jacksonville's 879 run-scoring offense (2nd in NL). Should Win: Johnson Runnerup: Branson