We had a tour for 3 people at the 'comfort' level, and I can't imagine what additional service comes with the luxury level, because we were extremely comfortable. Himanshu and his team arranged beautiful hotels for us (including personalising according to our request of smaller hotels where we could get to know the staff), and everywhere we went we had local guides who really knew the monuments and had great pride in their city. We always had wonderful food (our favourite was when Himanshu took us on a street food tour of Jaipur), but were very well looked after and no one got sick throughout the entire trip. One of our tour members was an older lady who was not very fit, but our driver was able to take us basically door to door most of the time, so she was fine despite the heat.
Everything about our trip was personalised according to our tastes - what we wanted to see, what kind of food we wanted to eat, how long we wanted to be out and about each day - I have never been so well taken care of on a holiday. It was a wonderful way to see this beautiful country, and I came back filled with happy memories.