Sonim XP1=KPN Porto 300.

Typically for KPN they've bought a phone, had the manufacturer stick on a KPN label and they're selling it for a lot more than the standard price.

Only difference I can see is that they are offering Push2Talk with their business subscriptions.

http://www.kpn.com/kpn/show?aboform=buy&compare=prices&dbid=393631&id=1564392&saleschannelid=102237