Along the lines of my previous "Airlifters Side by Side" thread here are some FSX comparison shots that show 3 generations of U.S. Navy patrol planes on the flight line at North Island Naval Air Station in San Diego (KNZY).
"The Past" represented by the Lockheed P2V-7 "Neptune" (FSX model by Alpha Sim) was in service from the 1950's thru early 1970's; "The Present" in the form of the Lockheed P3 "Orion" entered service in the early 60's and the "C" model (FSX verson by Team FS KBT) remains the frontline airplane today in both the U.S. and a number of other countries; and "The Future" is the Boeing P8A "Poseidon" (FS2004 model by Project Opensky), a 737 derivative scheduled to begin replacing the P3 in 2013.
These shots give a good idea of the relative size and characteristics of these airplanes. Besides the jet engines one major visual difference between the P8 and the P2 and P3 is the absence of the distinctive magnetic anomoly detection tail "stinger" found on the earlier airplanes. To be 100% complete this series should also include the Martin P5M "Marlin" seaplane which served alongside the P2V-7 for roughly the same time period but I didn't see a handy one for FSX.
Hope these shots are of interest to some folks