This might seem a duplicate question, since beginers have a lot of doubt about not using 是 instead of 很 as in 我很好, but there's nothing related to what I'm asking here. At least I haven't found anything.
What does a native speaker think about the difference between a sentence using 是...的 and the same one using 很? For example:
这本书是新的。
这本书很新。
商店的衣服是贵的。
商店的衣服很贵。
Thank you.