Hi,
Well, under the Features tab of the HikaShop configuration, you have settings to activate the wishlist system of HikaShop.
And you can configure it to display an "add to wishlist" button, similar to the "add to cart" button you have.
It won't display as a heart though. If you want to have it as a heart, you'll have to do a translation override to change the text of the button to a heart using font awesome.
Otherwise, I recommend using this plugin :
www.hikashop.com/marketplace/product/155-product-like-btn.html
It will display a heart on the products listing. It can also display a listing of all the liked products.
It's different from a wishlist however as there is no "sharing" capability with it.
So what to use really depends on what you want to do.