Hi John,
The 20MP sensor in the Phantom 4 Pro and Mavic Pro 2 is in the same family as the Sony RX100. 1" sensor, 20MP. Limited DR.
The camera can handle a bit of highlights, (pull down), but really can't take much shadow push, so you need to bracket. But the DNG's are small and you can fit a ton on a 64GB card.
Other options, in the line are the Inspire 2 where you pick a gimbal and camera, and can get to 24MP in a larger sensor. However cost of the Inspire, weight of the Inspire, and noise have all kept me at the Phantom and or Mavic Pro line
The flight technology is amazing, camera, is a considerably lacking, but you can still get a very nice file with the sensor.
I use 5 shot AEB for all series, will often use a 6 set of bracketed shots. 30 in all. You won't need all of them but unlike a DSLR on the ground where you have unlimited time, you need to maximize your flight time.
Capture One 12 does a wonderful job on both Phantom and Mavic raw, LR, IMO is going to get too noisy too fast, but does have a good lens correction.
I find the Phantom 4 camera/lens to be a better performer but it's loud (even the P4 Vr 2.) and tends to attract attention. A MP2, is almost a stealth drone, it's so quiet. I use both iOS and Android devices to control them.
Right now the Mavic Pro 2 is about the reasonable option since the Phantoms have been pretty much withdrawn from marketing. Mavic Pro 2 is great for distance, control, weight (packs into a space the size of the Nikon 24-70VR and weighs less. Camera lens is really the main issue for me as the quality is just not there, the Hasselblad logo is just that, and has fooled quite a few folks who thing Hasselblad really developed the lens, No way. Well if they did, they did not make a lens up to their standards. Actually Hasselblad just helped out on the raw and video processing.
You can fly in all the National forest land in Colorado also, just can't fly in National Parks, so you have a ton of remote airspace to consider. I envy you.
You can get a OK 24 x 36 out of a MP2 multi shot series, lot of work, but it's a very unique aspect (aerial) and one I did not appreciate until recently.
With the Topaz suite, for sharpening and Gigapixel, you can get a very nice overall image.
I would give the MP2 a try. The Zoom is the same old 1 2/3's sensor that was in the Mavic Pro Platinum, very limited in DR.
Paul C