My big Dilemma, keep Sigma 35 after buying Nikon 18-35g?
So, you sold your 14-24. If I remember correctly, that amazing Nikon 14-24mm survived to the comparisson to the versatile and very good 16-35mm and as a result the 16-35mm was the lens you have get rid of. Now I'm scratching my head as of to why someone would sell his much praised 14-24 only to get a 18-35mm G? I know that somehow I am missing something...
Do you own tests, with what you like to shoot, and buy based on your own needs and preferences. As you should know, there are always trade offs or compromises. If you don't feel the increase in sharpness of the Sigma prime is worth the trade off for the flexibility & convenience of the zoom then sell the prime. I always think it's a good idea to do your own tests and not rely on others. Yeah, there are some gurus here that can give you advice on lens testing but at the end of the day you have to figure out what is most important for yourself. It's just like some noob that buys a D800E and 24-70 then never takes it anywhere because it's too heavy and they'd rather have a D3200 with 35mm DX prime. To each their own and don't worry lens reputations.