As dotman mentions, I used a Sawtooth for the first time for a recent hunt and really liked it. It's definitely a different setup from my Cimarron. With the Sawtooth, you have an entrance and a place for gear and a stove and then room at the "back" for 2-3 people (if you do the mod to delete the rear pole). Even though you still have to hug the pole to stand, there is more headroom than a Cimarron, even with stake extensions.
Tim and I talked about it quite a bit and I still love the Cimarron for a lighter weight option that can be pitched with trekking poles or a tree limb much easier.
Although I haven't seen a Redcliff in person, its size advantages seem to be countered by its weight and cost. Here's how I kind of have it in my mind.
Solo shelter:
When weight matters, the Cimarron is a slam dunk as it has plenty of space for one person and is a super light option. When weight doesn't matter as much, the Sawtooth will probably get the nod and obviously the Redcliff would be a mansion for one person.
Two people:
When weight matters, the Cimarron will still probably get the call as it's still plenty of room for two and a stove. The two doors make it easy for each person to have their own entry without having to crawl over the other person. However, if you are running a nest, it may be tough to get two 1-person nests in the Cimarron and doubling up in a 2-person nest with another dude might be a little close for comfort.
For a moderate weight increase, the Sawtooth would be great for two people. Even though you only have one entrance, you can get in and out without really having to crawl over the other person. You might be able to get two 1-person nests in the Sawtooth, I just haven't tried. However, if someone ever comes out with a nice 2-3 person nest for the Sawtooth (or I get around to making one) it will be a solid shelter for two people.
The Redcliff has much more floor space as far as I can tell and should easily accommodate two nests if needed. But, it almost seems like overkill for two people unless you anticipate being stuck in the tent for long periods of time waiting out the weather.
Three people:
While the Cimarron can definitely accommodate three people, tight with a stove, I only think it would be a last option if planning a trip for three guys.
The Sawtooth would be the slam dunk for three as long as I did the rear pole mod. Even with the rear pole, I think you can fit three if necessary. Again, with a custom nest, the Sawtooth would be great for 3 in any situation.
The Redcliff would definitely be a great option for 3 people. If needing nests, I'm not sure how that would work exactly but I'm sure it's doable.
4 people:
While the Redcliff would obviously shine here, I'm still on the fence of saying that I'd rather just have two Cimarrons or a Cimarron and a Sawtooth. It just allows for more options of where and how to pitch camp. It allows one or two people to maybe do a spike camp somewhere else and the remaining people could still fit in the remaining shelter.
Caveats: I'm no expert and plenty of folks have spent much more time in the field than I have. This is just my observation after a recent trip. I'll also mention that I talk about nests when people could easily use bivys. I'm just not a bivy person as I just can't get used to being confined. I'd rather carry a few extra ounces and have a nest that had space to move around.
As with anything, what works for me may not work for others. Part of the fun is finding what works for you.