So my 24 1.4L II arrived from B&H this afternoon. Having rented the lens last week and been blown away with its performance, I knew what it was capable of in "real world" shooting situations:

Untitled by Nοah Fence, on Flickr
Though, being my first L lens and all, I decided to conduct an impromptu "formal" test just to see the differences between it and my 28mm 1.8 under relatively controlled conditions. Suffice it to say, my jaw hit the floor and I had to mop up the drool. Let me preface this by saying that I'm not a pixel peeper, gearhead, or test chart shooter. The following results are 100% crops from the original images, representing about 50% of the frame (this means the edges of the test shots are actually mid-frame). Shot on a 5D Mark II, center AF point. No processing other than crop and jpeg compression. The 28 1.8 image was 1/3 stop underexposed, since I was geeking out so much over my new 24mm that I forgot 1.8 is actually 2/3 stop slower.
Canon 28 1.8 @ f/1.8:
ISO 100 1/50

Canon 24 1.4 II @ f/1.4:
ISO 100 1/60

My only regret is that I didn't spring for one of these babies sooner!

Untitled by Nοah Fence, on Flickr
Though, being my first L lens and all, I decided to conduct an impromptu "formal" test just to see the differences between it and my 28mm 1.8 under relatively controlled conditions. Suffice it to say, my jaw hit the floor and I had to mop up the drool. Let me preface this by saying that I'm not a pixel peeper, gearhead, or test chart shooter. The following results are 100% crops from the original images, representing about 50% of the frame (this means the edges of the test shots are actually mid-frame). Shot on a 5D Mark II, center AF point. No processing other than crop and jpeg compression. The 28 1.8 image was 1/3 stop underexposed, since I was geeking out so much over my new 24mm that I forgot 1.8 is actually 2/3 stop slower.
Canon 28 1.8 @ f/1.8:
ISO 100 1/50

Canon 24 1.4 II @ f/1.4:
ISO 100 1/60

My only regret is that I didn't spring for one of these babies sooner!