I love hearing from people that like to claim they know what's in the Android Marketplace aka Google Play, when they have never used an Android phone to know and if they have, it was "several years ago".
Every app I had on my iPhone 4, I have on my Galaxy S2 and now S3, save for one and that was a niche app for the medical field. Twitter, tweetbot aka tweetcaster, facebook, photo transfer app, whats app, flighttracker and every major airline, tasks (similar to clear but better integrated with google), PS Touch and express, youtube, netflix, imdb, i.tv, paypal, ebay, amazon, target, dropbox, sugarsync, g drive, tapatalk, pandora, and every major game (max payne, gta 3, angry birds, etc). I would have to list another hundred apps I have. Point is, these apps are identical or 99% identical to iOS apps. And I would know, since I use both OS's every single day, and cnstantly checking and updating from both app stores, plus cydia. Peace.
The last time I compared apps with an Android user who jihad the Rezound, he indeed had many of the same apps I did. He had no alternative for many of my favorite games, my photography or video apps, and a bunch of my favorite niche apps, but as you said he did have many of the mainstream apps.
However, as soon as I said, "Oh cool, you have that app too, let's open it on both phones and see how it compares." he ran into problems.
In some cases the app just didn't open. It immediately force closed.
In other cases, the app opened, but didn't have all of the features.
In other cases, the app opened, but the formatting was way off, and the app just didn't look good.
In other cases (Real Racing 2 notably), the app seemed to run perfectly, but would randomly freeze for 5 seconds every minute or so.
In other cases, (Grand Theft Auto 3 notably) the app ran, but had frame rate issues.
In other cases, he opened the app, but it apparently didn't finish installing and started downloading the rest of the app. Unfortunately, he was running out of space on his internal drive, and had to mess with some "install this app to my external disk" app, but didn't want to take the time.
I asked him if he could get a specific app I had, and he said he could, but he'd have to go inside and mess with some config files to get it to install.
So sure, if we were comparing a checklist of apps, he would have checked the majority of mainstream apps I have, but that doesn't tell the full story.