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the katsu curry is (imo) very well made but it's not trying to be anything fancy, just nice & simple, they also do char sui bao which i'm crazy over.
it used to be that their restaurant on london bridge made all the hot food and it was delivered to the shop so just before midday all the currys would arrive and sold on first come first served basis so was better to go for early lunch as gamble it might have sold out if you leave it too late. that was mid 2010's though so I'm sure things could have changed by now.
edit: seems like the london bridge restaurant is now in leather lane and they have a takeaway stall outside.
I still get a bit wistful when i think of the katsu curry lunches from mugen by farringdon station when i worked in the area. so good