Newbie here but not a Nikonian

I have a 5dMkiii, 16-35 IIf 2.8, 24-70 IIf 2,8 and 70-200 IIf2.8 - a dream combination. I have sold my 7D because my 5D mkIII and 24-70 ii f2.8 is so sharp I can crop past the 7d and still have better photos BUT this three lens + camera combo is a lot of weight for travel photography.

Not over the moon with a 60d and 18-200 but have looked seriously at a Nikon 7100 and 18-300 combo for travel. On latest Scott Kelby BH video for travel he has dumped his great lenses and substituted a single 18-300. The video assumes this is the lens he has used for the photos he expertly manipulates with photoshop. Juza users rate this lens 9.7/10. I am on the fence. I have a travel photo bag and only what fits in goes. The 5dMkIII 24-70II is so good I am wondering if this alone with cropping will outperform a 7100/18-300.

regards, Neil