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Did you notice any CA with the 18x50's? Both the 12's and 15's exhibit a little... it's very slight but it present.
Did you measure the close focus distance?
I don't understand why the 18's are ~ 15% more expensive, when it appears there should be no difference in manufacturing expense.
Looking at Jupiter, were you able to discern any bands?
We've still got a couple months before Saturn is visible again... did you happen to look at it with the 18's?
Looking at small faint objects, I also find the IS with both doesn't eliminate the shake 100%, but it sure helps a lot... goes from a shake to a sway.
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