Moving Iron Frequency Response

Yes,but what I found with Ortofon is that they normally give frequency response values over 20Hz-20Khz,then a frequency range figure which is different again can be given(i.e The OM series).Here are some interesting specs Ortofon VMS-20 E Mk II Type
Moving Iron Output (1Khz 50 mm/sec)5mv Freq Response
20Hz - 20kHz Output Impedance
800 ohms Load Impedance
47k ohms L/R Separation 1kHz
> 25db
L/R Balance 1kHz
< 2db Stylus Tip
Nude Elliptical Cantilever
?? Dynamic Compliance x 10-6cm/Dyne Static Compliance
30 x 10-6 cm/Dyne VTF 0.8-1.2gm
Mass: 5gm
Grado
MF3E+ Type
Moving Iron Output (1Khz 50 mm/sec)5mv Freq Response 10Hz - 55kHz Output Impedance
800 ohms Load Impedance
47k ohms L/R Separation 1kHz
> 25 db
L/R Balance 1kHz
< ?db Stylus Tip

Now these two look similar except the Grado has a high frequency response given (10Hz-55Khz)and the 800 ohms load impedance is the same.Please forgive my ignorance here.Any comment?

No, most have coils with inductances an order of magnitude larger than the Grado's, and that electrically limits the high frequency response. In using such devices, I don't agree with the common practice of adding capacitance to the load, as it just makes the high frequency resonant peak worse and lowers its frequency. Using the lowest capacitance possible will maximize the high frequency extension.