The following is a simple picture I drew and colored to highlight the differences in color and quality in each of the different marker pen brands tested.

Test Bic Marking Fine

Test Sharpie Markers Fine

Test Stabilo Point 88 Fineliners

Test Staedtler triplus Fineliners 334

Test Faber Castell Connector Pens

Test Faber Castell GRIP Finepens

Test Staedtler Noris Club Fibre tips

Test TOUCHNEW Sketch Markers

Test Art n Fly Dual Tip Fineliners

Test_Ohuhu_Picture