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It may be real but it isn't necessarily related to PIP. Lots of things contribute to picture sharpness including the apes who delivered it, the tube type, age, etc. Even tubes next to each other on the assembly line can vary to some degree.
Magnetic fields (including tube position relative to the Earth) and anything that draws power can mess with the image. If completely bored try setting them next to each other (facing the same direction) a foot or more apart and away from walls and powered devices/speakers. Degauss if they allow it, and compare.
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