isEqualTest.m

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    NSArray* baseArray = @[
                           [[NSObject alloc] init],
                           [[NSObject alloc] init],
                           [[NSObject alloc] init],
                           [[NSObject alloc] init]
                           ];
    
    NSMutableArray* (^arrayMaker)(NSArray*) = ^(NSArray* baseArray){
        NSMutableArray* array = [NSMutableArray arrayWithCapacity:baseArray.count];
        for (id obj in baseArray) {
            [array addObject:obj];
        }
        return array.copy;
    };
    
    NSArray* arr1 = arrayMaker(baseArray);
    NSArray* arr2 = arrayMaker(baseArray);
    
    NSLog(@"arr1           -> %p", arr1);
    NSLog(@"arr2           -> %p", arr2);
    NSLog(@"==             -> %d", (arr1 == arr2));
    NSLog(@"isEqual        -> %d", [arr1 isEqual:arr2]);
    NSLog(@"isEqualToArray -> %d", [arr1 isEqualToArray:arr2]);
    
}

NSLog.txt

2013-06-17 03:39:58.199 isEqualTest[42330:c07] arr1           -> 0x75899c0
2013-06-17 03:39:58.200 isEqualTest[42330:c07] arr2           -> 0x7589a40
2013-06-17 03:39:58.200 isEqualTest[42330:c07] ==             -> 0
2013-06-17 03:39:58.201 isEqualTest[42330:c07] isEqual        -> 1
2013-06-17 03:39:58.201 isEqualTest[42330:c07] isEqualToArray -> 1