How do you differentiate good customer service from superior customer service?

GOOD customer service is the ability to meet the customers needs SUPERIOR customer service is the ability of an organisation to constantly and consistently exceed customers’ expectations” The reality of good customer service is what your customers expect from you at every contact they have with you.
And the reality of SUPERIOR customer service is what you expect from your customer at every contact you have with them.

When the customer comes frequently to purchase the services/products the company offers.

To surpass customer`s expectation and give them a "wow" exclamation which keeps them coming back for more services and broadcast of the superiority service to other prospective customers.

Dealing Fine and product quality Provision of spare parts The duration of the warranty and commitment to provide free spare parts during the warranty period Express Service

There are several ways the easiest way is make a questionnaire for customer when solving the problem or know the degree of customer satisfaction with the service provided has it been solve all his problems as required and the time

Customer satisfaction mean giving your best service where customer give a smile on his face and tell thank you.

Good customer service builds customer confidence and loyalty because the customer knows the organization is truly interested in meeting the customers' expectations in a friendly, kind and respectful manner. Customers don't want hassles or disappointments, especially when they are paying for a product or service. Good customer service removes these barriers and concerns for the customer. Good customer service = a confident and loyal customer = higher sales

To satisfy customer need within the ambit of banking rules and regulations

A good service to customer is fix at Right first time, Trust in the dealership and what we promise we deliver to customer.

Superior customer always looks for Exceptional service Quality and Apart for Service addtional jobs done free of cost in Warranty. This gives more logic to high profile customer.

via customer feedback survey quantified naming xyz vs.
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As the name suggests a good customer service is a generally delivered service which is fairly to client satisfaction where as superior customer service is a detailed, superb service delivered to client satisfaction and expectations leaving only complement.