AhsanAllahu ilaykum. I have alot of muslim competitors to my business. If I have a drive to compete (without haram) and be the best business with better service, marketing, sales etc (thus customers coming to me and they lose out) - is it an ok intention and ambition that i win n they lose?

Why is it that u win and they lose ask Allah to make you all successful and u can do what is best for you without intending to harm them, and it is not considered as harming them if u provide the best service and people come to you. But have good intentions that Allah bestows upon all of you.