Some good replies here. As I said above, not having tried Black Bottle, I do not have a handle on how much peat, smoke, phenol, etc. to expect. However, for the current list of Islay bottlings, I'd rank them in increasing order of "Islayness":
Bunnahabhain 12 Bruichladdich 10 or 15 (I have the 15, never tasted the 10) then the peaty Caol Ila 12 (I have the 18 - the 12 might be a bit heavier) Bowmore Legend NAS (recent bottlings are quite nice) Lagavulin 16 Ardbeg 10 Laphroaig 10 (I also have the 15 but not opened it yet)
I did my own mini-tasting last night with the Caol Ila 18, Ardbeg 10 and Laphroaig 10. The Caol Ila had the least peat with nice complexity, a great malt. Ardbeg 10 is one of my favorites. Lots of peat/smoke with a slightly sweet sherry background that fades to dryness. A very big Islay malt. Laphroaig 10 has all the power of peat/smoke but also a lot of dryness, less sweet but very complex.
Some of these are described as having an "iodine" character. As a chemist, I know what iodine smells like and I don't agree. I suspect the character is a salt air odor which is quite pleasant; some also call it seaweed. Since I live in the center of the continent in the U.S. I can't relate to seaweed odors either.
Note that it is difficult to find the most recent reviews of these bottlings. These malts do vary from year to year in subtle details but not usually house style. There are also different bottlings for different markets. I've heard that Japan gets different blends of some malts. Also, there are variations on strength. For example Laphroaig 10 has been bottled at both 40 and 43 abv in the same year. All of my bottles are 750ml U.S. market.