Everything I have read since owning a PW for 5 years was that the front is 1.5"-2" taller and the rear about 1" taller than the average normal 2500 Hemi. Visually a PW looks like a 2500 with a front leveling kit (typically that height range). Every stock PW I have seen on a dealer lot looks obviously taller than the regular 2500's parked next to them. And that's just not the tires either. The spring rates of a PW are also well known and documented to be softer than a regular 2500. That is the main reason the payload/GVWR and towing capacity is a good bit lower on a PW. The above posts are probably the first time I ever heard somebody claim there is less lift than that, and of course the people making those claims do not own a PW.
If you look on the Thuren Fabrication webpage (if you don't know, this is one of the "big names" in Ram suspensions) they list the exact same front lift coil part number as being 3" of lift on a regular 2500 but only 1.5" lift on a PW. So the math on this also corresponds with the PW being about 1.5" taller stock on average in the front. In regards to spring rate, the site states these coils are 26-30% softer on a regular 2500 but are 6% stiffer on a PW. The math would mean that the factory PW front springs are 30+% softer than a regular 2500.
For the rear, they list the exact same part number rear coils as being a 1" lift on a regular 2500 but stock height on a PW. Again, the math would mean that the PW is about 1" taller in the rear.
There is also a Power Wagon specific page on this forum. That would be a good place to post this question, but guarantee every response will be that the PW does sit higher and has lower spring rates.