I agree that the sound in the track would blend into a mix well, but also that the guitar wouldn't be in front.
I usually use small diaphragm condensers up close (like the 14th fret) in an x-y stereo pattern. If I want more bass, I move closer to the soundhole (17th fret?) and further away for less. Often, I use a third mic that is omni further away, in order to pick up some room, if it's good. Mic placement is a gigantic factor with acoustics.
Technically, the 990 is a small diaphragm condenser, but I've had a hard time getting a good sound from it for acoustics, too. The 991/603 which uses the same diaphragm in a pencil mic body is better for some reason. What Astatics are those?
If you get a chance, get your friend to play both the Martin and your acoustic while you stand back an listen, so that you can get familiar with the difference in sound - this will help you later on