A key has been added, written on Clairefontaine paper, with a number of different inks for reference.
Standard Disclaimer: Image provided only to give a general sense of the color. The vibrance and nuance are typically lost when an ink is digitized.

Review
When I write a review, I first focus on color, and award an ink 0 to 100 based upon that alone, separate from other considerations. I then deduct points from the color score for defects (ie: lack of flow, creep, etc), to arrive at an overall score.
Color
I've just spent a lot of time looking over a number of inks, and out of them all, I like Noodler's Navy the best, by a good margin. This may sound cliché, but the color is electric on the page. It jumps out at you. The shading and nuance are fantastic. Plus, there is no reason why this ink couldn't be used everyday, for all standard purposes, as it's not a fluorescent green or red-black, but decidedly blue.
All of the above considered, I like to be conservative in my reviews. With the holy grail of inks being 100, Noodler's Navy is a solid 94.
Color Score = 94
Deductions
Noodler's Navy is messy, and it creeps. The creep isn't terrible, and the mess bearable, but these shortcomings will keep me looking for that perfect ink.
-5
Overall Score = 89 out of 100