Scopes are a very personal thing - what works for one person will not work for another.
I owned a 35x Leup mk4 that I struggled with and I found that it really strained my right eye - to the point that my right eye felt weak / strained after a 30 shot course.
Jon Harris had a 35x Leup mk4 that he considered to be one of the best scope he had used.
The scope I used was Jon's old scope and he got it back not longer after I sold it.
I love my 45 Leup comp and I owned a 35 comp that would out do the mk4 every time - for me - everyone is different though and you should try as many options as you can if you have the money and time