Full frame and decent glass leaves plenty of room to crop, especially if you only use the images in their digital form. 
Taken with a 5DII & 70-200 f2.8 L IS MkII
Before:
		
		
	
	
		 
	
DierenPark Amersfoort by .monk3y, on Flickr
Crop:
		 
	
DierenPark Amersfoort by .monk3y, on Flickr
			
			Taken with a 5DII & 70-200 f2.8 L IS MkII
Before:
DierenPark Amersfoort by .monk3y, on Flickr
Crop:
DierenPark Amersfoort by .monk3y, on Flickr
 
	             
						
					 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		