@ Somnambulist: Sorry for the hindrance, happy to be of help!
@ h1a8: They both have different sound signatures and you will hear things differently with both, for the most part. I find the SM3's combination of balance, smoothness, 3D presentation with amazing width, detail, bass power, dynamics, and true to the recording presentation to make most of my music extremely involving and fun. Of course there are some tracks that are boring and therefore are boring on the SM3, but I now skip those
Speaking of an armature with a great soundstage, I too have been looking for IE8 soundstage width but a better overall presentation. I thought that is you had the soundstage width, you would in turn lose the depth. The GR8 actually has a pretty large soundstage when matched with a good source (DAC and amp that can convey the info), and the CK10 has a great 3D presentation. But I was truly amazed, and am now extraordinarily happy that the SM3 has both the width and the depth/height I have been looking for. Plus, the bass isn't light by any means, it is powerful and reverberant, but still fast and controlled. Faster and more controlled than the FX700. More reverberant than the other BA's I own.
It does have a very full sound, and compared to others such as the CK10, e-Q7, and even the FX700 to an extent. But the integration across the spectrum is also amazing. When I got the FX700, I thought it was extremely good, but as James444 had said, the e-Q7 also was a keeper because it is very different and does some things better than the FX700. The SM3 has made them both expendable to me. I will be either selling my FX700 soon or loaning it out. But 2 of the 3 people I would loan it to have already said no, and all three have the SM3 on order.
I am thinking I want to either get another SM3 as a backup or get an EM3Pro.
My final thought is the FX700 is an exceptional IEM, very detailed, awesome bass, and great soundstage width. I would say the best low end of any IEM I have heard save 1. And the best for any dynamic. You already know what I think of the SM3