You guys should really give nikchen's modded MS-Pro's a try. The MS-Pro as some might know, is a more tame version of the RS-1 (I speculate, never heard the RS-1). Add liberators with gs-1000 pads and you have the MS-Ultimate. This fellow has a very big soundstage, though lacking the vertical stage which the k701's excel in. They have that body which is sometimes missed by the k701, and have slam... which is missing from the k701's almost all-together. They also posses a very cohesive sound, which is normal for most phones (in my experience to say the least) but absent in the K701. To me, the AKG almost is akin to a componenet speaker system, the treble seems to be separate on its own somewhere. Detail on the MS-Ultimate is atleast on par with the k701. It also has that trademark grado emotion/aggressiveness sprinkled in.
This might come across as k701 bashing, but alas I love my K701's. They lack slam but possess depth in the lower frequencies that I didn't hear neither in my HD-6000 or my Denon AH-D2000. Yes, the AKG will go lower. The mid frequencies, in my system, are very smooth and lush, making them a dream when listening to female vocals and just in general enjoying the textural experience of a musical piece. Indeed you wouldn't listen to electronic music for these, but put on a quality electro track and listen to the texture of the synth's with the AKG, amazing. The highs took me about a week, for my ears to get used to the AKG sound sig, after that I didn't find them at all fatiguing and can listen continuously for many hours. Indeed whether exaggerated or not the K701 provides a very clean and resolving listening experience.
The MS-Ultimate is most definitely worth checking out if you liked the K701 but wanted a bit more bass, body, or a more cohesive sound. And most importantly wanted that slam back 
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