Product Options show price

Indeed, that's something we didn't account for.

You need to edit the file "option" of the view "product" vi the menu Display->Views and change the line:
if(!empty($optionElement->prices)){
by:
if(!empty($optionElement->prices) && $this->params->get('show_price')){
and the line:
if(!empty($variant->prices)){
by:
if(!empty($variant->prices) && $this->params->get('show_price')){

Yes, on the current release it's option and not optionElement.
You need to do the second change as well.
That solves the problem on our end. Note that the show prices option of the Display tab of the config needs to be turned off.

For the products without variants, that's indeed how it's displayed for now. In next version of HikaShop, they will display like the others, so you will have to wait for next version.