£700 v £2,400 oven

£700 v £2,400 oven, why is there a £1,700 price difference? Is it worth it? Which kitchen oven appliance do you prefer?
iQ500 Oven: www.siemens-home.bsh-group.co...
iQ700 Oven: www.siemens-home.bsh-group.co...
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