That's an awesome picture
I always tend to underexpose by 1/3 on shots - I'm using a 300D so the metering isn't perfect :P I'm using an EF-S lens that uses L glass, but can't be qualified as L as it's EF-S, not EF (silly canon!)
I've never experienced any ghosting :/ Only trouble I've had is dust on the sensor.. turns out changing lenses near sand at an air show isn't smart
managed to clean it off ok tho! I just had to do some touch up work to it afterwards.
More back on topic: If you are using a polariser, if the end barrel of your lens doesn't rotate, you don't need to re-adjust. I forgot to re-adjust when using a zoom lens, had it on manual and then ended up with a lot of very poorly exposed photos.