Well, session done - always a bit stressful with location recording and suddenly a USB cable which didn't seem to want to collaborate. I was sweating bucks for a few minutes but luckily a change of port did the trick.
The combo U87 and 4047 is really good. Alone, the 87 outshined the 4047 - was actually the first time I thought the 87 was really great on something! It sounded perfect out of the box.
The room was very controlled and sounded pretty uniform - a little dead perhaps but better that than the opposite. After testing various position in the end I simply had the player face one of the huge bass traps columns and we called it a day. The 4047 was at "body" level and looking a little down, the 87 was a little higher (at mouth level) and at slight angle on the floor (maybe 10 degrees) but looking straight. Perhaps the slight inclination of the 4047 was detrimental to the sound. It's not sounding bad, but it would need more processing, alone, to get a produced sound - at least one right for the track..
I kept the two mics near each other to avoid phase problems if I wanted to use both, and it turned to be a good idea since I did (use both).
As last time, I'm amazed at how noisy the mechanical keys of the sax are when standing nearby recording, and how the clicks completely disappear on the recording itself.
Now I've spent 10 minutes comping and mixing, and using both mics, with hard panning left and right and reverse-panned reverbs sounds pretty amazing. As said, the 87 alone sounds good, but adding the other microphone really makes things 3D.. the two sounds complement each other very well. Slight compression with my LA2A, added a tiny bit of stereo reverb, and that's it.
Since we had limited time, we never tried the dynamic microphone, but luckily dont feel i missed anything.
Now the challenge is upping the game on the rest of the parts

Thanks everyone who took time to respond.