I have some measurement results for different values of
1206 SMD resistors. Basically they all have about 50fF of shunt capacitance, although at lowish resistance, other effects start to take precedence.There is some info about the setup and some plots of the results at . I haven't really taken a detailed look around the transition region between resistive and capacitive impedance. There's a link to the frequency-magnitude data that should allow anyone curious enough to see for themselves.
Regards, Jeroen Belleman