On a normal aircraft no change, field elevation plus what ever fudge the AOM calls for {ie field elevation plus some fixed figure or corection for density alt, depends on AC type} But on some all magic aircraft the presure controller gets its info from the altimeter setting on the pilots display, which is a good reason not to use QFE {I only know of one aircraft like this and I belive they are all now modified} Other magic aircraft know where you are landing and dont care if you are using QFE, but again, why use QFE?