I gave the 4-16 a try because I couldn't stand the tunneling on the early 5-25. I use 4-5x when calling coyotes sometime and looking down a $2.5k toilet paper tube just felt stupid. Did it prevent good shots? No. But it sure rubbed me wrong. I have owned at least one 4-16 at all times since then.
I kind of agree with what someone alluded to earlier...the 4-20 doesn't really offer much that the 7-35x doesn't unless you absolutely need to go <7x. Just the 4-16x42's turrets alone would make the 4-20 way more appealing imo.