The Abramsprise is 725 meters and that is coming from ILM ... that is a kind of BS given that it was designed to be something over 3000 ft long according to John Eaves. Either way, that ship is at least 2.5 times the size of Enterprise true.
The new Enterprise model kit from Revell is listed as 1:500 scale. Assuming it's about 24" in size, that makes the "actual" length about 1000 ft. Not sure how "canon" that is, but it's much more in-line with the original size.
I think at some point or another, ILM has to come clean and admit they screwed up.
According to Encounter the Enterprise, the height of the Enterprise is 625.5 feet (190.5 meters). If we double the height of this Dreadnought, it would be 381 meters high, or the same height as the Empire State Building.
When you put it that way, it sounds pretty ridiculous, doesn't it.