What are Sony G Lens ? Are they superior to Sony Carl Zeiss lens in a digital camera?

Sony G lens or Carl zeiss varrio tessar lens .which is the best for compact digital camera? Plz sir advise me which lens is better carl Zeiss or Sony G lens in terms of Clarity? Discover Questions Canon eos 600D or Nikon D5200 or Sony alpha 58 ? Suggest m

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