I have a Canon 70D. The lenses I have are Tamron 70-300, Tamron 60 Macro, Canon 10-18, Canon 50 and a Canon 18-130. I use the 18-130 as my walkaround lens but I find that the sharpness is lacking. I am looking for an upgrade as a walkaround lens in the $1500 budget range. I favoured the 24-70 Tamron or the 24-110 Canon but think the focal range may be too compromised on a crop sensor camera. Any suggestions would be most welcome.