Furutech FI-50 NCF (R) vs FI-28 (R) Differences?

I would appreciate experiences on the comparison between FI-50 NCF (R) and FI-28 (R). Is there a noticeable or significant difference between the two plugs. I am aware the FI-50 NCF (R) is the top-of-the-line and supposed to be very good. However, they cost much more than the FI-28. Does the additional cost translate to a noticeable or worthwhile difference, or the difference is subtle or marginal at best?

I would appreciate any experiences on this matter. The wire that will be used on the plugs both AC connector and IEC would be FP-TCS31.

Thanks.