We stayed in a Concierge studio and did end up with Savanna view, but that's not the reason to book concierge. Our regular Savanna view on the Uzima Savanna was superior. We enjoyed the Concierge staff, the food and beverage offerings at the lounge, the special elevator keycard (gold), and the opportunity to book both the Sunrise and Sunset Safaris.
Hope you'll enjoy your stay more than the last.