How about:
1) 你能看到差别吗?Can you see the difference?
2) 你看得见差别吗?Do you see the difference?
3) 绝对有差别。There is a difference (emphatic form).
I personally don't understand the difference between "区别" and "差别“,and there's also a "分别" and a "差异". Could someone explain how and why to use these different terms?