Pedal upgrade

I'm currently rocking a pair of Shimano R540 pedals which do the job, however I've got some Wiggle vouchers which need spent.
Would I notice any difference (apart from 100grams) if I upgraded to 105 Carbon or Ultegra ones? Or is the difference marginal?
Would I notice any difference (apart from 100grams) if I upgraded to 105 Carbon or Ultegra ones? Or is the difference marginal?
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I found my Ultegras marginally easier to clip into than my old 105s. That's it.