You are showing your ignorance Dover. 47K is not standard for a MC and not standard with the Etna Lambda, which I am listening to as I type this. 47K is the standard for MM. Not for MC.Actually 47K is the standard input impedance for all phono sections, MM or LOMC.
LOMC cartridges often seem to need lower impedances, but this is really for the benefit of the phono preamp, not the cartridge, due to the reasons Jonathan Carr has talked about, mentioned earlier on this thread.
I've been telling people this for years. If your phono section does not have troubles with the RFI caused by most LOMC cartridges (and the capacitance of the tonearm cable) then 47K will sound just fine.
An additional side benefit will be less ticks and pops, since the phono preamp will generate ticks and pops if the input section is overloaded by the RFI at its input. It is for this reason that tubes have a distinct advantage over solid state, as its easier to designed a phono section using tubes that is hard to overload.