Texas Knifemakers and Jantz both carry the same bread cutter. TKS' BL587C has a cryo treatment and is one of the sharpest bread knives I have ever seen. The one I ordered from them was RC 58.5 hard. TKS will hardness test any kit knife they sell for free.
As for cryo after HT I had Dtec do an experiment and that was to complete the HT on a 440C knife including final temper. Then Dave measured its hardness and then he put it in liquid nitrogen overnight and the knife gained 0.9 hardness, almost a full point of hardness which is significant enough for me to pay the extra $4 for cryo. So a finished stainless knife does improve with a final cryo with some caveats like CPM S30V requires a temper after each cryo. Or if you cryo'd the knife between tempers I would guess it would not improve much.
http://www.texasknife.com/vcom/produ...roducts_id=479