What's the difference between the cookie lens of Panasonic GF2, 14-42 lens and 14 lens?

Panasonic GF2 biscuit lens (it is a very thin lens, such as 20mm F 1.7, in fact, 14mm F2.5 is also considered) and 14-42mm F3.5-5.6 lens are different as follows:

1, 14mm are fixed-focus wide-angle lenses, and 14-42 mm are wide-angle zoom lenses;

2. 14mm maximum aperture 2.5, 14-42 mm maximum aperture 3.5-5.6;

3. 14mm is suitable for shooting landscapes (wide angle) and macro (large aperture), and 14-42 mm is suitable for shooting landscapes (wide angle) and portraits (42mm);

4. 14mm thin imaging is better, and 14-42 mm is larger in size and wider in applicability;

5. 14mm is expensive (about 3700), and 14-42 mm is relatively cheap (about 1800).