n41 is officially in my neighborhood! It's not on my home site just yet but it's getting closer. This site was about a 5 minute drive from my house. Still 40MHz according to engineering screens.
The site it was on didn't even have 600MHz antennas on it so T-Mobile clearly sees Band 41 as priority number 1 right now.
In my experience, the markets that had 5 B41 carriers didn't have it on every tower. It was a limited rollout. Now that may have changed after I left Sprint, but I highly doubt it since Dallas and Houston were still littered with old Clearwire equipment.